# What is CVE-2021-44228?

> CVE-2021-44228 is a critical-severity flaw (CVSS 10.0) in Log4j from Apache, published on 10 December 2021. It is on the list of flaws known to be exploited, so criminals are already using it. The latest forecast puts its chance of use in the next 30 days at over 99%. If you run an affected version, patch it first.

Canonical page: https://www.precursorintelligence.com/what-is/cve-2021-44228

## At a glance

- **Verdict:** Fix this now. Attackers are using this flaw today. If you run an affected version, it goes to the top of your list.
- **Precursor Intelligence risk score:** 90 out of 100 (Critical); action: Emergency patch. Kept up to date as the evidence changes.
- **Severity:** Critical (CVSS 10.0 out of 10)
- **Known to be exploited:** Yes, it is on the government list of flaws known to be exploited
- **Chance of use in the next 30 days:** over 99% (latest exploit-likelihood forecast)
- **Published:** 10 December 2021
- **Record last updated:** 27 October 2025
- **Main product:** Log4j from Apache
- **Affected products:** 144

## What is CVE-2021-44228? In plain terms

It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can read data, change data and take it offline.

### The official description

Apache Log4j2 2.0-beta9 through 2.15.0 (excluding security releases 2.12.2, 2.12.3, and 2.3.1) JNDI features used in configuration, log messages, and parameters do not protect against attacker controlled LDAP and other JNDI related endpoints. An attacker who can control log messages or log message parameters can execute arbitrary code loaded from LDAP servers when message lookup substitution is enabled. From log4j 2.15.0, this behavior has been disabled by default. From version 2.16.0 (along with 2.12.2, 2.12.3, and 2.3.1), this functionality has been completely removed. Note that this vulnerability is specific to log4j-core and does not affect log4net, log4cxx, or other Apache Logging Services projects.

### What kind of flaw is it?

- CWE-20: Improper Input Validation
- CWE-400: Uncontrolled Resource Consumption
- CWE-502: Deserialization of Untrusted Data
- CWE-917: Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')

### How an attack on it works

- Where an attacker can be: Anywhere on the internet
- How hard it is to pull off: Easy: no special conditions
- Login needed first: No login needed
- Does someone have to click: No, nobody has to do anything
- What an attacker gets: Can read data, change data and take it offline

Severity vector: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`

## Is CVE-2021-44228 being exploited? Yes

Attackers are already using it. It is on the government list of flaws known to be exploited, and the latest forecast puts the chance of it being used in the next 30 days at over 99%.

Exploit likelihood over the last 7 days: >99%, >99%, >99%, >99%, >99%, >99%, >99%.

### Timeline

- 10 December 2021: Published
- 27 October 2025: Record last updated

### How Precursor Intelligence ranks it

CVE-2021-44228 scores **90 out of 100 (Critical)**, with the action "Emergency patch".

Every published flaw gets a risk score from 0 to 100, kept up to date as the evidence changes. Four things go into the score, from the one that counts most to the ones that count less:

- Evidence it is being exploited: biggest factor
- How severe it is: strong factor
- How widely exposed it is: smaller factor
- Threat activity around it: smaller factor

85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score. When this flaw matches software you track, it lands in your list with its score and the reasons behind it.

## Who is affected by CVE-2021-44228?

The published record lists 144 products. Versions are as published: "2.0.1 to before 2.3.1" means from 2.0.1 up to, but not including, 2.3.1.

- [Log4j](https://www.precursorintelligence.com/product/apache/log4j) by [Apache](https://www.precursorintelligence.com/vendors/apache) (Application): 2.0-beta9, 2.0-rc1, 2.0-rc2, 2.0, 2.0.1 to before 2.3.1, 2.4.0 to before 2.12.2, 2.13.0 to before 2.15.0
- [Webex Meetings Server](https://www.precursorintelligence.com/product/cisco/webex_meetings_server) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 3.0, 3.0, 3.0-maintenance_release1, 3.0-maintenance_release2, 3.0-maintenance_release3, 3.0-maintenance_release3_security_patch4, 3.0-maintenance_release3_security_patch5, 3.0-maintenance_release3_service_pack_2, 3.0-maintenance_release3_service_pack_3, 3.0-maintenance_release4, 4.0, 4.0-maintenance_release1, 4.0-maintenance_release2, 4.0-maintenance_release3
- [Connected Analytics for Network Deployment](https://www.precursorintelligence.com/product/cisco/connected_analytics_for_network_deployment) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): 006.004.000.003, 006.005.000., 006.005.000.000, 007.000.001, 007.001.000, 007.002.000, 7.3, 007.003.000, 007.003.001.001, 007.003.003, 008.000.000, 008.000.000.000.004
- [UCS Central Software](https://www.precursorintelligence.com/product/cisco/ucs_central_software) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): 2.0(1a), 2.0(1b), 2.0(1c), 2.0(1d), 2.0(1e), 2.0(1f), 2.0(1g), 2.0(1h), 2.0(1k), 2.0(1l), 2.0
- [Firepower Threat Defense](https://www.precursorintelligence.com/product/cisco/firepower_threat_defense) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): 6.2.3, 6.3.0, 6.4.0, 6.5.0, 6.6.0, 6.7.0, 7.0.0, 7.1.0
- [Fxos](https://www.precursorintelligence.com/product/cisco/fxos) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 6.2.3, 6.3.0, 6.4.0, 6.5.0, 6.6.0, 6.7.0, 7.0.0, 7.1.0
- [Network Dashboard Fabric Controller](https://www.precursorintelligence.com/product/cisco/network_dashboard_fabric_controller) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): 11.0(1), 11.1(1), 11.2(1), 11.3(1), 11.4(1), 11.5(1), 11.5(2), 11.5(3)
- [Unified Customer Voice Portal](https://www.precursorintelligence.com/product/cisco/unified_customer_voice_portal) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 11.6, 11.6, 12.0(1), 12.5(1), 12.6(1), 12.0, 12.5
- [Desigo CC Advanced Reports](https://www.precursorintelligence.com/product/siemens/desigo_cc_advanced_reports) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): 3.0, 4.0, 4.1, 4.2, 5.0, 5.1
- [SD-WAN Vmanage](https://www.precursorintelligence.com/product/cisco/sd-wan_vmanage) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 20.3.4.1, 20.4 to before 20.4.2.1, 20.5 to before 20.5.1.1, 20.6 to before 20.6.2.1, 20.7, 20.8
- [Cloudcenter Suite](https://www.precursorintelligence.com/product/cisco/cloudcenter_suite) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): 4.10(0.15), 5.3(0), 5.4(1), 5.5(0), 5.5(1)
- [Identity Services Engine](https://www.precursorintelligence.com/product/cisco/identity_services_engine) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 2.4.0, 2.4.0, 003.000(000.458), 003.001(000.518), 003.002(000.116)
- [Unified Contact Center Enterprise](https://www.precursorintelligence.com/product/cisco/unified_contact_center_enterprise) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 11.6(2), 12.0(1), 12.5(1), 12.6(1), 12.6(2)
- [Vesys](https://www.precursorintelligence.com/product/siemens/vesys) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): before 2019.1, 2019.1, 2019.1-sp1912, 2020.1, 2021.1
- [Crosswork Network Automation](https://www.precursorintelligence.com/product/cisco/crosswork_network_automation) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): 2.0.0, 3.0.0, 4.1.0, 4.1.1
- [Dna Center](https://www.precursorintelligence.com/product/cisco/dna_center) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 2.1.2.8, 2.2.2.0 to before 2.2.2.8, 2.2.2.8, 2.2.3.0 to before 2.2.3.4
- [Energyip](https://www.precursorintelligence.com/product/siemens/energyip) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): 8.5, 8.6, 8.7, 9.0
- [Network Services Orchestrator](https://www.precursorintelligence.com/product/cisco/network_services_orchestrator) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 5.3.5.1, 5.4 to before 5.4.5.2, 5.5 to before 5.5.4.1, 5.6 to before 5.6.3.1
- [Spectrum Power 4](https://www.precursorintelligence.com/product/siemens/spectrum_power_4) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): before 4.70, 4.70, 4.70-sp7, 4.70-sp8
- [Video Surveillance Manager](https://www.precursorintelligence.com/product/cisco/video_surveillance_manager) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): 7.14(1.26), 7.14(2.26), 7.14(3.025), 7.14(4.018)
- [WAN Automation Engine](https://www.precursorintelligence.com/product/cisco/wan_automation_engine) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 7.3.0.2, 7.4, 7.5, 7.6
- [Business Process Automation](https://www.precursorintelligence.com/product/cisco/business_process_automation) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 3.0.000.115, 3.1.000.000 to before 3.1.000.044, 3.2.000.000 to before 3.2.000.009
- [Capital](https://www.precursorintelligence.com/product/siemens/capital) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): before 2019.1, 2019.1, 2019.1-sp1912
- [Debian Linux](https://www.precursorintelligence.com/product/debian/debian_linux) by [Debian](https://www.precursorintelligence.com/vendors/debian) (Operating system): 9.0, 10.0, 11.0
- [Enterprise Chat and Email](https://www.precursorintelligence.com/product/cisco/enterprise_chat_and_email) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 12.0(1), 12.5(1), 12.6(1)
- [Evolved Programmable Network Manager](https://www.precursorintelligence.com/product/cisco/evolved_programmable_network_manager) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): up to 4.1.1, 5.0, 5.1
- [Smart Phy](https://www.precursorintelligence.com/product/cisco/smart_phy) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 3.2.1, 3.2.1, 21.3
- [Solid Edge Harness Design](https://www.precursorintelligence.com/product/siemens/solid_edge_harness_design) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): before 2020, 2020, 2020-sp2002
- [Spectrum Power 7](https://www.precursorintelligence.com/product/siemens/spectrum_power_7) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): before 2.30, 2.30, 2.30-sp2
- [Unified Contact Center Express](https://www.precursorintelligence.com/product/cisco/unified_contact_center_express) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 12.5(1), 12.6(1), 12.6(2)
- [Automated Subsea Tuning](https://www.precursorintelligence.com/product/cisco/automated_subsea_tuning) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 2.1.0, 02.01.00
- [Common Services Platform Collector](https://www.precursorintelligence.com/product/cisco/common_services_platform_collector) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 2.9.1.3, 2.10.0 to before 2.10.0.1
- [Crosswork Data Gateway](https://www.precursorintelligence.com/product/cisco/crosswork_data_gateway) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 2.0.2, 3.0.0
- [Crosswork Network Controller](https://www.precursorintelligence.com/product/cisco/crosswork_network_controller) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 2.0.1, 3.0.0
- [Crosswork Optimization Engine](https://www.precursorintelligence.com/product/cisco/crosswork_optimization_engine) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 2.0.1, 3.0.0
- [Crosswork Platform Infrastructure](https://www.precursorintelligence.com/product/cisco/crosswork_platform_infrastructure) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 4.0.1, 4.1.0
- [Crosswork Zero Touch Provisioning](https://www.precursorintelligence.com/product/cisco/crosswork_zero_touch_provisioning) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 2.0.1, 3.0.0
- [Desigo CC Info Center](https://www.precursorintelligence.com/product/siemens/desigo_cc_info_center) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): 5.0, 5.1
- [Emergency Responder](https://www.precursorintelligence.com/product/cisco/emergency_responder) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 11.5(4), 11.5
- [Fedora](https://www.precursorintelligence.com/product/fedoraproject/fedora) by [Fedoraproject](https://www.precursorintelligence.com/vendors/fedoraproject) (Operating system): 34, 35
- [Prime Service Catalog](https://www.precursorintelligence.com/product/cisco/prime_service_catalog) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 12.1, 12.1
- [Sentron Powermanager](https://www.precursorintelligence.com/product/siemens/sentron_powermanager) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): 4.1, 4.2
- [Sipass Integrated](https://www.precursorintelligence.com/product/siemens/sipass_integrated) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): 2.80, 2.85
- [Siveillance Identity](https://www.precursorintelligence.com/product/siemens/siveillance_identity) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): 1.5, 1.6
- Unified Communications Manager Im & Presence Service by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): 11.5(1.22900.6), 11.5(1)
- [Unity Connection](https://www.precursorintelligence.com/product/cisco/unity_connection) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 11.5(1), 11.5
- [Virtualized Infrastructure Manager](https://www.precursorintelligence.com/product/cisco/virtualized_infrastructure_manager) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 3.2.0, 3.4.0 to before 3.4.4
- [6bk1602-0aa12-0tp0 Firmware](https://www.precursorintelligence.com/product/siemens/6bk1602-0aa12-0tp0_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 2.7.0
- [6bk1602-0aa22-0tp0 Firmware](https://www.precursorintelligence.com/product/siemens/6bk1602-0aa22-0tp0_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 2.7.0
- [6bk1602-0aa32-0tp0 Firmware](https://www.precursorintelligence.com/product/siemens/6bk1602-0aa32-0tp0_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 2.7.0
- [6bk1602-0aa42-0tp0 Firmware](https://www.precursorintelligence.com/product/siemens/6bk1602-0aa42-0tp0_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 2.7.0
- [6bk1602-0aa52-0tp0 Firmware](https://www.precursorintelligence.com/product/siemens/6bk1602-0aa52-0tp0_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 2.7.0
- [Active Iq Unified Manager](https://www.precursorintelligence.com/product/netapp/active_iq_unified_manager) by [Netapp](https://www.precursorintelligence.com/vendors/netapp) (Application): version not specified
- [Advanced Malware Protection Virtual Private Cloud Appliance](https://www.precursorintelligence.com/product/cisco/advanced_malware_protection_virtual_private_cloud_appliance) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 3.5.4
- [Broadworks](https://www.precursorintelligence.com/product/cisco/broadworks) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 2021.11_1.162
- [Brocade SAN Navigator](https://www.precursorintelligence.com/product/netapp/brocade_san_navigator) by [Netapp](https://www.precursorintelligence.com/vendors/netapp) (Application): version not specified
- [Cloud Connect](https://www.precursorintelligence.com/product/cisco/cloud_connect) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 12.6(1)
- [Cloud Insights](https://www.precursorintelligence.com/product/netapp/cloud_insights) by [Netapp](https://www.precursorintelligence.com/vendors/netapp) (Application): version not specified
- [Cloud Manager](https://www.precursorintelligence.com/product/netapp/cloud_manager) by [Netapp](https://www.precursorintelligence.com/vendors/netapp) (Application): version not specified
- [Cloud Secure Agent](https://www.precursorintelligence.com/product/netapp/cloud_secure_agent) by [Netapp](https://www.precursorintelligence.com/vendors/netapp) (Application): version not specified
- [Cloudcenter](https://www.precursorintelligence.com/product/cisco/cloudcenter) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 4.10.0.16
- [Cloudcenter Cost Optimizer](https://www.precursorintelligence.com/product/cisco/cloudcenter_cost_optimizer) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 5.5.2
- [Cloudcenter Suite Admin](https://www.precursorintelligence.com/product/cisco/cloudcenter_suite_admin) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 5.3.1
- [Cloudcenter Workload Manager](https://www.precursorintelligence.com/product/cisco/cloudcenter_workload_manager) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 5.5.2
- [Comos](https://www.precursorintelligence.com/product/siemens/comos) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): before 10.4.2
- [Computer Vision Annotation Tool](https://www.precursorintelligence.com/product/intel/computer_vision_annotation_tool) by [Intel](https://www.precursorintelligence.com/vendors/intel) (Application): version not specified
- [Connected Mobile Experiences](https://www.precursorintelligence.com/product/cisco/connected_mobile_experiences) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): version not specified
- [Contact Center Domain Manager](https://www.precursorintelligence.com/product/cisco/contact_center_domain_manager) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 12.5(1)
- [Contact Center Management Portal](https://www.precursorintelligence.com/product/cisco/contact_center_management_portal) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 12.5(1)
- [Customer Experience Cloud Agent](https://www.precursorintelligence.com/product/cisco/customer_experience_cloud_agent) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 1.12.1
- [Cx Cloud Agent](https://www.precursorintelligence.com/product/cisco/cx_cloud_agent) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): 001.012
- [Cyber Vision](https://www.precursorintelligence.com/product/cisco/cyber_vision) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): 4.0.2
- [Cyber Vision Sensor Management Extension](https://www.precursorintelligence.com/product/cisco/cyber_vision_sensor_management_extension) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 4.0.3
- [Data Center Network Manager](https://www.precursorintelligence.com/product/cisco/data_center_network_manager) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 11.3(1)
- [Datacenter Manager](https://www.precursorintelligence.com/product/intel/datacenter_manager) by [Intel](https://www.precursorintelligence.com/vendors/intel) (Application): before 5.1
- [Dna Spaces](https://www.precursorintelligence.com/product/cisco/dna_spaces) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): version not specified
- [Dna Spaces Connector](https://www.precursorintelligence.com/product/cisco/dna_spaces_connector) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): version not specified
- Dna Spaces\\ by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 2.5
- [E-Car Operation Center](https://www.precursorintelligence.com/product/siemens/e-car_operation_center) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): before 2021-12-13
- [Email Security](https://www.precursorintelligence.com/product/sonicwall/email_security) by [SonicWall](https://www.precursorintelligence.com/vendors/sonicwall) (Application): before 10.0.13
- [Energy Engage](https://www.precursorintelligence.com/product/siemens/energy_engage) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): 3.1
- [Energyip Prepay](https://www.precursorintelligence.com/product/siemens/energyip_prepay) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): before 3.8.0.12
- [Finesse](https://www.precursorintelligence.com/product/cisco/finesse) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 12.6(1)
- [Fog Director](https://www.precursorintelligence.com/product/cisco/fog_director) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): version not specified
- [Genomics Kernel Library](https://www.precursorintelligence.com/product/intel/genomics_kernel_library) by [Intel](https://www.precursorintelligence.com/vendors/intel) (Application): version not specified
- [Gma-Manager](https://www.precursorintelligence.com/product/siemens/gma-manager) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): before 8.6.2j-398
- [Head-End System Universal Device Integration System](https://www.precursorintelligence.com/product/siemens/head-end_system_universal_device_integration_system) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): all versions
- [Industrial Edge Management](https://www.precursorintelligence.com/product/siemens/industrial_edge_management) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): all versions
- [Industrial Edge Management Hub](https://www.precursorintelligence.com/product/siemens/industrial_edge_management_hub) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): before 2021-12-13
- [Integrated Management Controller Supervisor](https://www.precursorintelligence.com/product/cisco/integrated_management_controller_supervisor) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 2.3.2.1
- [Intersight Virtual Appliance](https://www.precursorintelligence.com/product/cisco/intersight_virtual_appliance) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 1.0.9-361
- [IOT Operations Dashboard](https://www.precursorintelligence.com/product/cisco/iot_operations_dashboard) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): version not specified
- Logo! Soft Comfort by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): all versions
- [Mendix](https://www.precursorintelligence.com/product/siemens/mendix) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): all versions
- [Mindsphere](https://www.precursorintelligence.com/product/siemens/mindsphere) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): before 2021-12-16
- [Mobility Services Engine](https://www.precursorintelligence.com/product/cisco/mobility_services_engine) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): version not specified
- [Navigator](https://www.precursorintelligence.com/product/siemens/navigator) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): before 2021-12-13
- [Network Assurance Engine](https://www.precursorintelligence.com/product/cisco/network_assurance_engine) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 6.0.2
- [Network Insights for Data Center](https://www.precursorintelligence.com/product/cisco/network_insights_for_data_center) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): 6.0(2.1914)
- [Nexus Dashboard](https://www.precursorintelligence.com/product/cisco/nexus_dashboard) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 2.1.2
- [Nexus Insights](https://www.precursorintelligence.com/product/cisco/nexus_insights) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 6.0.2
- [NX](https://www.precursorintelligence.com/product/siemens/nx) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): all versions
- [Oncommand Insight](https://www.precursorintelligence.com/product/netapp/oncommand_insight) by [Netapp](https://www.precursorintelligence.com/vendors/netapp) (Application): version not specified
- [Oneapi Sample Browser](https://www.precursorintelligence.com/product/intel/oneapi_sample_browser) by [Intel](https://www.precursorintelligence.com/vendors/intel) (Application): version not specified
- [Ontap Tools](https://www.precursorintelligence.com/product/netapp/ontap_tools) by [Netapp](https://www.precursorintelligence.com/vendors/netapp) (Application): version not specified
- [Opcenter Intelligence](https://www.precursorintelligence.com/product/siemens/opcenter_intelligence) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): 3.2 to before 3.5
- [Operation Scheduler](https://www.precursorintelligence.com/product/siemens/operation_scheduler) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): up to 1.1.3
- [Optical Network Controller](https://www.precursorintelligence.com/product/cisco/optical_network_controller) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 1.1.0
- [Packaged Contact Center Enterprise](https://www.precursorintelligence.com/product/cisco/packaged_contact_center_enterprise) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 11.6
- [Paging Server](https://www.precursorintelligence.com/product/cisco/paging_server) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 14.4.1
- [Rhythmyx](https://www.precursorintelligence.com/product/percussion/rhythmyx) by [Percussion](https://www.precursorintelligence.com/vendors/percussion) (Application): up to 7.3.2
- [Secure Device Onboard](https://www.precursorintelligence.com/product/intel/secure_device_onboard) by [Intel](https://www.precursorintelligence.com/vendors/intel) (Application): version not specified
- [Siguard Dsa](https://www.precursorintelligence.com/product/siemens/siguard_dsa) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): 4.2 to before 4.4.1
- [Siveillance Command](https://www.precursorintelligence.com/product/siemens/siveillance_command) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): up to 4.16.2.1
- [Siveillance Control Pro](https://www.precursorintelligence.com/product/siemens/siveillance_control_pro) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): all versions
- [Siveillance Vantage](https://www.precursorintelligence.com/product/siemens/siveillance_vantage) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): all versions
- [Siveillance Viewpoint](https://www.precursorintelligence.com/product/siemens/siveillance_viewpoint) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): all versions
- [Snapcenter](https://www.precursorintelligence.com/product/netapp/snapcenter) by [Netapp](https://www.precursorintelligence.com/vendors/netapp) (Application): version not specified
- [Snow Commander](https://www.precursorintelligence.com/product/snowsoftware/snow_commander) by [Snowsoftware](https://www.precursorintelligence.com/vendors/snowsoftware) (Application): before 8.10.0
- [Solid Edge Cam Pro](https://www.precursorintelligence.com/product/siemens/solid_edge_cam_pro) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): all versions
- Solidfire & Hci Storage Node by [Netapp](https://www.precursorintelligence.com/vendors/netapp) (Application): version not specified
- [Solidfire Enterprise Sds](https://www.precursorintelligence.com/product/netapp/solidfire_enterprise_sds) by [Netapp](https://www.precursorintelligence.com/vendors/netapp) (Application): version not specified
- [Sppa-T3000 Ses3000 Firmware](https://www.precursorintelligence.com/product/siemens/sppa-t3000_ses3000_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): all versions
- [Synchro](https://www.precursorintelligence.com/product/bentley/synchro) by [Bentley](https://www.precursorintelligence.com/vendors/bentley) (Application): 6.1 to before 6.2.4.2
- [Synchro 4d](https://www.precursorintelligence.com/product/bentley/synchro_4d) by [Bentley](https://www.precursorintelligence.com/vendors/bentley) (Application): before 6.4.3.2
- [System Studio](https://www.precursorintelligence.com/product/intel/system_studio) by [Intel](https://www.precursorintelligence.com/vendors/intel) (Application): version not specified
- [Teamcenter](https://www.precursorintelligence.com/product/siemens/teamcenter) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): all versions
- [UCS Central](https://www.precursorintelligence.com/product/cisco/ucs_central) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 2.0(1p)
- [UCS Director](https://www.precursorintelligence.com/product/cisco/ucs_director) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 6.8.2.0
- [Unified Communications Manager](https://www.precursorintelligence.com/product/cisco/unified_communications_manager) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 11.5(1)
- [Unified Communications Manager Im and Presence Service](https://www.precursorintelligence.com/product/cisco/unified_communications_manager_im_and_presence_service) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 11.5(1)
- [Unified Computing System](https://www.precursorintelligence.com/product/cisco/unified_computing_system) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): 006.008(001.000)
- [Unified Contact Center Management Portal](https://www.precursorintelligence.com/product/cisco/unified_contact_center_management_portal) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): 12.6(1)
- [Unified Intelligence Center](https://www.precursorintelligence.com/product/cisco/unified_intelligence_center) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 12.6(1)
- [Unified SIP Proxy](https://www.precursorintelligence.com/product/cisco/unified_sip_proxy) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): before 10.2.1v2
- [Unified Workforce Optimization](https://www.precursorintelligence.com/product/cisco/unified_workforce_optimization) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): before 11.5(1)
- [Video Surveillance Operations Manager](https://www.precursorintelligence.com/product/cisco/video_surveillance_operations_manager) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 7.14.4
- [Virtual Topology System](https://www.precursorintelligence.com/product/cisco/virtual_topology_system) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 2.6.7
- [Virtualized Voice Browser](https://www.precursorintelligence.com/product/cisco/virtualized_voice_browser) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 12.5(1)
- [VM Access Proxy](https://www.precursorintelligence.com/product/snowsoftware/vm_access_proxy) by [Snowsoftware](https://www.precursorintelligence.com/vendors/snowsoftware) (Application): before 3.6
- [Workload Optimization Manager](https://www.precursorintelligence.com/product/cisco/workload_optimization_manager) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 3.2.1
- [Xcode](https://www.precursorintelligence.com/product/apple/xcode) by [Apple](https://www.precursorintelligence.com/vendors/apple) (Application): before 13.3
- [Xpedition Enterprise](https://www.precursorintelligence.com/product/siemens/xpedition_enterprise) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): version not specified
- [Xpedition Package Integrator](https://www.precursorintelligence.com/product/siemens/xpedition_package_integrator) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): version not specified

## How do I fix CVE-2021-44228?

1. **Check whether you run it.** Compare your versions with the affected products above. Not sure what you run? Precursor Intelligence can work it out from your public website, or you can pick it from a list.
2. **Apply the vendor’s fix.** Install the update named in the vendor’s advisory. We’ve put the advisories and patch notes first in the list.
3. **If you can’t patch today.** Follow any mitigation the vendor publishes, and limit who can reach the affected system from the internet until the update is in.
4. **Check it wasn’t used before you patched.** Because criminals are already using this flaw, look for signs of a break-in on affected systems using the vendor’s guidance.

### References

- [msrc-blog.microsoft.com](https://msrc-blog.microsoft.com/2021/12/11/microsofts-response-to-cve-2021-44228-apache-log4j2/) (Patch, Third-party advisory, Vendor advisory)
- [logging.apache.org](https://logging.apache.org/log4j/2.x/security.html) (Release notes, Vendor advisory)
- [openwall.com](http://www.openwall.com/lists/oss-security/2021/12/10/1) (Mailing list, Mitigation, Third-party advisory)
- [openwall.com](http://www.openwall.com/lists/oss-security/2021/12/10/2) (Mailing list, Mitigation, Third-party advisory)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/165225/Apache-Log4j2-2.14.1-Remote-Code-Execution.html) (Third-party advisory, Vulnerability database)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/165260/VMware-Security-Advisory-2021-0028.html) (Third-party advisory, Vulnerability database)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/165261/Apache-Log4j2-2.14.1-Information-Disclosure.html) (Exploit, Third-party advisory, Vulnerability database)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/165270/Apache-Log4j2-2.14.1-Remote-Code-Execution.html) (Exploit, Third-party advisory, Vulnerability database)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/165281/Log4j2-Log4Shell-Regexes.html) (Third-party advisory, Vulnerability database)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/165282/Log4j-Payload-Generator.html) (Third-party advisory, Vulnerability database)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/165306/L4sh-Log4j-Remote-Code-Execution.html) (Third-party advisory, Vulnerability database)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/165307/Log4j-Remote-Code-Execution-Word-Bypassing.html) (Third-party advisory, Vulnerability database)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/165311/log4j-scan-Extensive-Scanner.html) (Broken link, Third-party advisory, Vulnerability database)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/165371/VMware-Security-Advisory-2021-0028.4.html) (Exploit, Third-party advisory, Vulnerability database)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/165532/Log4Shell-HTTP-Header-Injection.html) (Exploit, Third-party advisory, Vulnerability database)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/165642/VMware-vCenter-Server-Unauthenticated-Log4Shell-JNDI-Injection-Remote-Code-Execution.html) (Exploit, Third-party advisory, Vulnerability database)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/165673/UniFi-Network-Application-Unauthenticated-Log4Shell-Remote-Code-Execution.html) (Exploit, Third-party advisory, Vulnerability database)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/167794/Open-Xchange-App-Suite-7.10.x-Cross-Site-Scripting-Command-Injection.html) (Third-party advisory, Vulnerability database)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/167917/MobileIron-Log4Shell-Remote-Command-Execution.html) (Exploit, Third-party advisory, Vulnerability database)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/171626/AD-Manager-Plus-7122-Remote-Code-Execution.html) (Third-party advisory, Vulnerability database)
- [seclists.org](http://seclists.org/fulldisclosure/2022/Dec/2) (Exploit, Mailing list, Third-party advisory)
- [seclists.org](http://seclists.org/fulldisclosure/2022/Jul/11) (Mailing list, Third-party advisory)
- [seclists.org](http://seclists.org/fulldisclosure/2022/Mar/23) (Mailing list, Third-party advisory)
- [openwall.com](http://www.openwall.com/lists/oss-security/2021/12/10/3) (Mailing list, Third-party advisory)
- [openwall.com](http://www.openwall.com/lists/oss-security/2021/12/13/1) (Mailing list, Third-party advisory)
- [openwall.com](http://www.openwall.com/lists/oss-security/2021/12/13/2) (Mailing list, Third-party advisory)
- [openwall.com](http://www.openwall.com/lists/oss-security/2021/12/14/4) (Mailing list, Third-party advisory)
- [openwall.com](http://www.openwall.com/lists/oss-security/2021/12/15/3) (Mailing list, Third-party advisory)
- [cert-portal.siemens.com](https://cert-portal.siemens.com/productcert/pdf/ssa-397453.pdf) (Third-party advisory)
- [cert-portal.siemens.com](https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdf) (Third-party advisory)
- [cert-portal.siemens.com](https://cert-portal.siemens.com/productcert/pdf/ssa-661247.pdf) (Third-party advisory)
- [cert-portal.siemens.com](https://cert-portal.siemens.com/productcert/pdf/ssa-714170.pdf) (Third-party advisory)
- [github.com](https://github.com/cisagov/log4j-affected-db) (Third-party advisory)
- [github.com](https://github.com/cisagov/log4j-affected-db/blob/develop/SOFTWARE-LIST.md) (Broken link, Product, Government resource)
- [github.com](https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-44228) (Exploit, Third-party advisory)
- [lists.debian.org](https://lists.debian.org/debian-lts-announce/2021/12/msg00007.html) (Mailing list, Third-party advisory)
- [lists.fedoraproject.org](https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M5CSVUNV4HWZZXGOKNSK6L7RPM7BOKIB/) (Release notes)
- [lists.fedoraproject.org](https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VU57UJDCFIASIO35GC55JMKSRXJMCDFM/) (Release notes)
- [psirt.global.sonicwall.com](https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032) (Third-party advisory)
- [security.netapp.com](https://security.netapp.com/advisory/ntap-20211210-0007/) (Third-party advisory)
- [support.apple.com](https://support.apple.com/kb/HT213189) (Third-party advisory)
- [tools.cisco.com](https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd) (Third-party advisory)

## Questions

### What is CVE-2021-44228?

CVE-2021-44228 is a critical-severity flaw in Log4j from Apache, published on 10 December 2021. It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can read data, change data and take it offline.

### How serious is CVE-2021-44228?

It scores 10.0 out of 10 on the CVSS severity scale, which is critical. Our risk score for CVE-2021-44228 is 90 out of 100, which is Critical. Its action is "Emergency patch". Attackers are using this flaw today. If you run an affected version, it goes to the top of your list.

### Is CVE-2021-44228 being exploited?

Attackers are already using it. It is on the government list of flaws known to be exploited, and the latest forecast puts the chance of it being used in the next 30 days at over 99%.

### Which versions does CVE-2021-44228 affect?

For Log4j from Apache: 2.0-beta9, 2.0-rc1, 2.0-rc2, 2.0, 2.0.1 to before 2.3.1, 2.4.0 to before 2.12.2 and 1 more. The record lists 144 products in all, each with its versions, under "Who is affected" on this page.

### How do I fix CVE-2021-44228?

Install the update the vendor names in its advisory, linked first under "How do I fix" on this page. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet. Because criminals are already using it, also check affected systems for signs of a break-in.

## Does CVE-2021-44228 affect you?

Precursor Intelligence keeps checking for you:

- **Tell us what you run.** Pick your software from a list, or let us work it out from your website.
- **We match it to every flaw.** Over 400,000 published flaws, checked against your list.
- **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it.
- **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools.

Start free (no card, nothing to install): https://www.precursorintelligence.com/register
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