# What is CVE-2017-5645?

> CVE-2017-5645 is a critical-severity flaw (CVSS 9.8) in Log4j from Apache, published on 17 April 2017. It is not on the list of flaws known to be exploited today. The latest forecast puts its chance of use in the next 30 days at 90%. If you run an affected version, plan in the vendor’s fix.

Canonical page: https://www.precursorintelligence.com/what-is/cve-2017-5645

## At a glance

- **Verdict:** Fix this soon. Not confirmed as exploited yet, but serious or likely enough that it should not wait for a quiet month.
- **Precursor Intelligence risk score:** 77 out of 100 (High); action: Patch now. Kept up to date as the evidence changes.
- **Severity:** Critical (CVSS 9.8 out of 10)
- **Known to be exploited:** No, not on the list of flaws known to be exploited today
- **Chance of use in the next 30 days:** 90% (latest exploit-likelihood forecast)
- **Published:** 17 April 2017
- **Record last updated:** 20 April 2025
- **Main product:** Log4j from Apache
- **Affected products:** 79

## What is CVE-2017-5645? 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

In Apache Log4j 2.x before 2.8.2, when using the TCP socket server or UDP socket server to receive serialized log events from another application, a specially crafted binary payload can be sent that, when deserialized, can execute arbitrary code.

### What kind of flaw is it?

- CWE-502: Deserialization of Untrusted Data

### 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:U/C:H/I:H/A:H`

## Is CVE-2017-5645 being exploited? Not that we know of

It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 90%. That can change at any time, which is why we keep watching.

Exploit likelihood over the last 7 days: 90%, 90%, 90%, 90%, 90%, 90%, 90%.

### Timeline

- 17 April 2017: Published
- 20 April 2025: Record last updated

### How Precursor Intelligence ranks it

CVE-2017-5645 scores **77 out of 100 (High)**, with the action "Patch now".

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-2017-5645?

The published record lists 79 products. Versions are as published: "2.0 to before 2.8.2" means from 2.0 up to, but not including, 2.8.2.

- [Log4j](https://www.precursorintelligence.com/product/apache/log4j) by [Apache](https://www.precursorintelligence.com/vendors/apache) (Application): 2.0 to before 2.8.2
- [Policy Automation](https://www.precursorintelligence.com/product/oracle/policy_automation) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 10.4.7, 12.1.0, 12.1.1, 12.2.0, 12.2.1, 12.2.2, 12.2.3, 12.2.4, 12.2.5, 12.2.6, 12.2.7, 12.2.8, 12.2.9, 12.2.10
- [Policy Automation for Mobile Devices](https://www.precursorintelligence.com/product/oracle/policy_automation_for_mobile_devices) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 10.4.7, 12.1.0, 12.1.1, 12.2.0, 12.2.1, 12.2.2, 12.2.3, 12.2.4, 12.2.5, 12.2.6, 12.2.7, 12.2.8, 12.2.9, 12.2.10
- [Enterprise Linux](https://www.precursorintelligence.com/product/redhat/enterprise_linux) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 6.0, 6.7, 7.0, 7.3, 7.4, 7.5, 7.6
- [Flexcube Investor Servicing](https://www.precursorintelligence.com/product/oracle/flexcube_investor_servicing) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 12.0.4, 12.1.0, 12.3.0, 12.4.0, 14.0.0
- [Insurance Rules Palette](https://www.precursorintelligence.com/product/oracle/insurance_rules_palette) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 10.0, 10.1, 10.2, 11.0, 11.1
- [Weblogic Server](https://www.precursorintelligence.com/product/oracle/weblogic_server) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0, 12.2.1.4.0, 14.1.1.0.0
- [Bi Publisher](https://www.precursorintelligence.com/product/oracle/bi_publisher) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 11.1.1.7.0, 11.1.1.9.0, 12.2.1.3.0, 12.2.1.4.0
- [Insurance Policy Administration](https://www.precursorintelligence.com/product/oracle/insurance_policy_administration) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 10.0, 10.1, 10.2, 11.0
- [Retail Extract Transform and Load](https://www.precursorintelligence.com/product/oracle/retail_extract_transform_and_load) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 13.0, 13.1, 13.2, 19.0
- [Retail Integration Bus](https://www.precursorintelligence.com/product/oracle/retail_integration_bus) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 14.0.0, 14.1.0, 15.0, 16.0
- [Banking Platform](https://www.precursorintelligence.com/product/oracle/banking_platform) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 2.6.0, 2.6.1, 2.6.2
- [Enterprise Linux Server Eus](https://www.precursorintelligence.com/product/redhat/enterprise_linux_server_eus) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 7.4, 7.5, 7.6
- [Jdeveloper](https://www.precursorintelligence.com/product/oracle/jdeveloper) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 11.1.1.9.0, 12.1.3.0.0, 12.2.1.3.0
- [Mysql Enterprise Monitor](https://www.precursorintelligence.com/product/oracle/mysql_enterprise_monitor) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 3.4.0.0 to 3.4.7.4297, 4.0.0.0 to 4.0.4.5235, 8.0.0.0.0 to 8.0.0.8131
- [Retail Open Commerce Platform](https://www.precursorintelligence.com/product/oracle/retail_open_commerce_platform) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 5.3.0, 6.0.0, 6.0.1
- [Retail Service Backbone](https://www.precursorintelligence.com/product/oracle/retail_service_backbone) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 14.1, 15.0, 16.0
- [Siebel UI Framework](https://www.precursorintelligence.com/product/oracle/siebel_ui_framework) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 18.7, 18.8, 18.9
- [Soa Suite](https://www.precursorintelligence.com/product/oracle/soa_suite) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 12.1.3.0.0, 12.2.1.3.0, 12.2.2.0.0
- [Autovue Vuelink Integration](https://www.precursorintelligence.com/product/oracle/autovue_vuelink_integration) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 21.0.0, 21.0.1
- [Communications Pricing Design Center](https://www.precursorintelligence.com/product/oracle/communications_pricing_design_center) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 11.1, 12.0
- [Configuration Manager](https://www.precursorintelligence.com/product/oracle/configuration_manager) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 12.1.2.0.2, 12.1.2.0.5
- [Enterprise Linux Server Aus](https://www.precursorintelligence.com/product/redhat/enterprise_linux_server_aus) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 7.4, 7.6
- [Enterprise Linux Server Tus](https://www.precursorintelligence.com/product/redhat/enterprise_linux_server_tus) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 7.4, 7.6
- [Enterprise Manager Base Platform](https://www.precursorintelligence.com/product/oracle/enterprise_manager_base_platform) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 12.1.0.5, 13.2.0.0
- [Enterprise Manager for Fusion Middleware](https://www.precursorintelligence.com/product/oracle/enterprise_manager_for_fusion_middleware) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 12.1.0.5, 13.2.0.0
- [Enterprise Manager for Oracle Database](https://www.precursorintelligence.com/product/oracle/enterprise_manager_for_oracle_database) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 12.1.0.8, 13.2.2
- [Enterprise Manager for Peoplesoft](https://www.precursorintelligence.com/product/oracle/enterprise_manager_for_peoplesoft) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 13.1.1.1, 13.2.1.1
- [Financial Services Analytical Applications Infrastructure](https://www.precursorintelligence.com/product/oracle/financial_services_analytical_applications_infrastructure) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 7.3.3.0.0 to 7.3.3.0.2, 8.0.0.0.0 to 8.0.7.0.0
- [Financial Services Behavior Detection Platform](https://www.precursorintelligence.com/product/oracle/financial_services_behavior_detection_platform) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 6.1.1, 8.0.0.0.0 to 8.0.4.0.0
- [Financial Services Hedge Management and Ifrs Valuations](https://www.precursorintelligence.com/product/oracle/financial_services_hedge_management_and_ifrs_valuations) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 8.0.4, 8.0.5
- [Financial Services Lending and Leasing](https://www.precursorintelligence.com/product/oracle/financial_services_lending_and_leasing) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 12.5.0, 14.1.0 to 14.8.0
- [Financial Services Loan Loss Forecasting and Provisioning](https://www.precursorintelligence.com/product/oracle/financial_services_loan_loss_forecasting_and_provisioning) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 8.0.4, 8.0.5
- [Financial Services Profitability Management](https://www.precursorintelligence.com/product/oracle/financial_services_profitability_management) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 6.1.1, 8.0.0.0.0 to 8.0.7.0.0
- [Fusion Middleware Mapviewer](https://www.precursorintelligence.com/product/oracle/fusion_middleware_mapviewer) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 12.2.1.2, 12.2.1.3
- [Identity Management Suite](https://www.precursorintelligence.com/product/oracle/identity_management_suite) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 11.1.2.3.0, 12.2.1.3.0
- [In-Memory Performance-Driven Planning](https://www.precursorintelligence.com/product/oracle/in-memory_performance-driven_planning) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 12.1, 12.2
- [Insurance Calculation Engine](https://www.precursorintelligence.com/product/oracle/insurance_calculation_engine) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 10.1.1, 10.2.1
- [Jd Edwards Enterpriseone Tools](https://www.precursorintelligence.com/product/oracle/jd_edwards_enterpriseone_tools) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 4.0.1.0, 9.2
- [Primavera Gateway](https://www.precursorintelligence.com/product/oracle/primavera_gateway) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 16.2.0 to 16.2.11, 17.12.0 to 17.12.7
- [Rapid Planning](https://www.precursorintelligence.com/product/oracle/rapid_planning) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 12.1, 12.2
- [Retail Advanced Inventory Planning](https://www.precursorintelligence.com/product/oracle/retail_advanced_inventory_planning) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 14.0, 15.0
- [API Gateway](https://www.precursorintelligence.com/product/oracle/api_gateway) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 11.1.2.4.0
- [Application Testing Suite](https://www.precursorintelligence.com/product/oracle/application_testing_suite) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 13.3.0.1
- [Communications Converged Application Server - Service Controller](https://www.precursorintelligence.com/product/oracle/communications_converged_application_server_-_service_controller) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 6.1
- [Communications Instant Messaging Server](https://www.precursorintelligence.com/product/oracle/communications_instant_messaging_server) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 10.0.1.3.0
- [Communications Interactive Session Recorder](https://www.precursorintelligence.com/product/oracle/communications_interactive_session_recorder) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 6.0 to 6.2
- [Communications Messaging Server](https://www.precursorintelligence.com/product/oracle/communications_messaging_server) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): before 8.0.2
- [Communications Network Integrity](https://www.precursorintelligence.com/product/oracle/communications_network_integrity) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 7.3.2 to 7.3.6
- [Communications Online Mediation Controller](https://www.precursorintelligence.com/product/oracle/communications_online_mediation_controller) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 6.1
- [Communications Service Broker](https://www.precursorintelligence.com/product/oracle/communications_service_broker) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 6.0
- [Communications Webrtc Session Controller](https://www.precursorintelligence.com/product/oracle/communications_webrtc_session_controller) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): before 7.2
- [Endeca Information Discovery Studio](https://www.precursorintelligence.com/product/oracle/endeca_information_discovery_studio) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 3.2.0
- [Enterprise Data Quality](https://www.precursorintelligence.com/product/oracle/enterprise_data_quality) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 12.2.1.3.0
- [Enterprise Linux Desktop](https://www.precursorintelligence.com/product/redhat/enterprise_linux_desktop) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 7.0
- [Enterprise Linux Server](https://www.precursorintelligence.com/product/redhat/enterprise_linux_server) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 7.0
- [Enterprise Linux Workstation](https://www.precursorintelligence.com/product/redhat/enterprise_linux_workstation) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 7.0
- [Enterprise Manager for Mysql Database](https://www.precursorintelligence.com/product/oracle/enterprise_manager_for_mysql_database) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): up to 13.2.2.0.0
- [Financial Services Regulatory Reporting with Agilereporter](https://www.precursorintelligence.com/product/oracle/financial_services_regulatory_reporting_with_agilereporter) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 8.0.9.2.0
- [Fuse](https://www.precursorintelligence.com/product/redhat/fuse) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Application): 1.0
- [Goldengate](https://www.precursorintelligence.com/product/oracle/goldengate) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 12.3.2.1.1
- [Goldengate Application Adapters](https://www.precursorintelligence.com/product/oracle/goldengate_application_adapters) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 12.3.2.1.1
- [Identity Analytics](https://www.precursorintelligence.com/product/oracle/identity_analytics) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 11.1.1.5.8
- [Identity Manager Connector](https://www.precursorintelligence.com/product/oracle/identity_manager_connector) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 9.0
- [Instantis Enterprisetrack](https://www.precursorintelligence.com/product/oracle/instantis_enterprisetrack) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 17.1 to 17.3
- [Oncommand API Services](https://www.precursorintelligence.com/product/netapp/oncommand_api_services) by [Netapp](https://www.precursorintelligence.com/vendors/netapp) (Application): version not specified
- [Oncommand Insight](https://www.precursorintelligence.com/product/netapp/oncommand_insight) by [Netapp](https://www.precursorintelligence.com/vendors/netapp) (Application): version not specified
- [Oncommand Workflow Automation](https://www.precursorintelligence.com/product/netapp/oncommand_workflow_automation) by [Netapp](https://www.precursorintelligence.com/vendors/netapp) (Application): version not specified
- [Peoplesoft Enterprise Fin Install](https://www.precursorintelligence.com/product/oracle/peoplesoft_enterprise_fin_install) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 9.2
- [Policy Automation Connector for Siebel](https://www.precursorintelligence.com/product/oracle/policy_automation_connector_for_siebel) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 10.4.6
- [Retail Clearance Optimization Engine](https://www.precursorintelligence.com/product/oracle/retail_clearance_optimization_engine) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 14.0.5
- [Retail Predictive Application Server](https://www.precursorintelligence.com/product/oracle/retail_predictive_application_server) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 15.0.3
- [Service Level Manager](https://www.precursorintelligence.com/product/netapp/service_level_manager) by [Netapp](https://www.precursorintelligence.com/vendors/netapp) (Application): version not specified
- [Snapcenter](https://www.precursorintelligence.com/product/netapp/snapcenter) by [Netapp](https://www.precursorintelligence.com/vendors/netapp) (Application): version not specified
- [Storage Automation Store](https://www.precursorintelligence.com/product/netapp/storage_automation_store) by [Netapp](https://www.precursorintelligence.com/vendors/netapp) (Application): version not specified
- [Tape Library Acsls](https://www.precursorintelligence.com/product/oracle/tape_library_acsls) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 8.4
- [Timesten in-Memory Database](https://www.precursorintelligence.com/product/oracle/timesten_in-memory_database) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 11.2.2.8.49
- [Utilities Advanced Spatial and Operational Analytics](https://www.precursorintelligence.com/product/oracle/utilities_advanced_spatial_and_operational_analytics) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 2.7.0.1
- [Utilities Work and Asset Management](https://www.precursorintelligence.com/product/oracle/utilities_work_and_asset_management) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 1.9.1.2.12

## How do I fix CVE-2017-5645?

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. **Keep an eye on it.** Track the product and we tell you as soon as we spot this flaw on the list of exploited flaws, or a jump in its exploit likelihood.

### References

- [oracle.com](http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html) (Patch)
- [oracle.com](http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html) (Patch)
- [oracle.com](http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html) (Patch)
- [oracle.com](http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html) (Patch, Third-party advisory)
- [issues.apache.org](https://issues.apache.org/jira/browse/LOG4J2-1863) (Issue tracking, Vendor advisory)
- [openwall.com](http://www.openwall.com/lists/oss-security/2019/12/19/2) (Mailing list, Third-party advisory)
- [securityfocus.com](http://www.securityfocus.com/bid/97702) (Third-party advisory, Vulnerability database)
- [securitytracker.com](http://www.securitytracker.com/id/1040200) (Third-party advisory, Vulnerability database)
- [securitytracker.com](http://www.securitytracker.com/id/1041294) (Third-party advisory, Vulnerability database)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:1417) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:1801) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:1802) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:2423) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:2633) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:2635) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:2636) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:2637) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:2638) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:2808) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:2809) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:2810) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:2811) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:2888) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:2889) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:3244) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:3399) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:3400) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2019:1545) (Third-party advisory)
- [lists.apache.org](https://lists.apache.org/thread.html/0dcca05274d20ef2d72584edcf8c917bbb13dbbd7eb35cae909d02e9%40%3Cdev.logging.apache.org%3E)
- [lists.apache.org](https://lists.apache.org/thread.html/277b4b5c2b0e06a825ccec565fa65bd671f35a4d58e3e2ec5d0618e1%40%3Cdev.tika.apache.org%3E)
- [lists.apache.org](https://lists.apache.org/thread.html/44491fb9cc19acc901f7cff34acb7376619f15638439416e3e14761c%40%3Cdev.tika.apache.org%3E)
- [lists.apache.org](https://lists.apache.org/thread.html/479471e6debd608c837b9815b76eab24676657d4444fcfd5ef96d6e6%40%3Cdev.tika.apache.org%3E)
- [lists.apache.org](https://lists.apache.org/thread.html/6114ce566200d76e3cc45c521a62c2c5a4eac15738248f58a99f622c%40%3Cissues.activemq.apache.org%3E)
- [lists.apache.org](https://lists.apache.org/thread.html/84cc4266238e057b95eb95dfd8b29d46a2592e7672c12c92f68b2917%40%3Cannounce.apache.org%3E)
- [lists.apache.org](https://lists.apache.org/thread.html/8ab32b4c9f1826f20add7c40be08909de9f58a89dc1de9c09953f5ac%40%3Cissues.activemq.apache.org%3E)
- [lists.apache.org](https://lists.apache.org/thread.html/9317fd092b257a0815434b116a8af8daea6e920b6673f4fd5583d5fe%40%3Ccommits.druid.apache.org%3E)
- [lists.apache.org](https://lists.apache.org/thread.html/e8fb7d76a244ee997ba4b217d6171227f7c2521af8c7c5b16cba27bc%40%3Cdev.logging.apache.org%3E)
- [lists.apache.org](https://lists.apache.org/thread.html/eea03d504b36e8f870e8321d908e1def1addda16adda04327fe7c125%40%3Cdev.logging.apache.org%3E)
- [lists.apache.org](https://lists.apache.org/thread.html/r0831e2e52a390758ce39a6193f82c11c295175adce6e6307de28c287%40%3Cissues.beam.apache.org%3E)
- [lists.apache.org](https://lists.apache.org/thread.html/r18f1c010b554a3a2d761e8ffffd8674fd4747bcbcf16c643d708318c%40%3Cissues.activemq.apache.org%3E)
- [lists.apache.org](https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.apache.org%3E)
- [lists.apache.org](https://lists.apache.org/thread.html/r23369fd603eb6d62d3b883a0a28d12052dcbd1d6d531137124cd7f83%40%3Cgithub.beam.apache.org%3E)
- [lists.apache.org](https://lists.apache.org/thread.html/r2ce8d26154bea939536e6cf27ed02d3192bf5c5d04df885a80fe89b3%40%3Cissues.activemq.apache.org%3E)
- [lists.apache.org](https://lists.apache.org/thread.html/r2ff63f210842a3c5e42f03a35d8f3a345134d073c80a04077341c211%40%3Cissues.activemq.apache.org%3E)
- [lists.apache.org](https://lists.apache.org/thread.html/r3784834e80df2f284577a5596340fb84346c91a2dea6a073e65e3397%40%3Cissues.activemq.apache.org%3E)
- [lists.apache.org](https://lists.apache.org/thread.html/r3a85514a518f3080ab1fc2652cfe122c2ccf67cfb32356acb1b08fe8%40%3Cdev.tika.apache.org%3E)
- [lists.apache.org](https://lists.apache.org/thread.html/r3d666e4e8905157f3c046d31398b04f2bfd4519e31f266de108c6919%40%3Cissues.activemq.apache.org%3E)
- [lists.apache.org](https://lists.apache.org/thread.html/r4b25538be50126194cc646836c718b1a4d8f71bd9c912af5b59134ad%40%3Cdev.tika.apache.org%3E)
- [lists.apache.org](https://lists.apache.org/thread.html/r61590890edcc64140e0c606954b29a063c3d08a2b41d447256d51a78%40%3Cissues.activemq.apache.org%3E)
- [lists.apache.org](https://lists.apache.org/thread.html/r681b4432d0605f327b68b9f8a42662993e699d04614de4851c35ffd1%40%3Cdev.tika.apache.org%3E)

## Questions

### What is CVE-2017-5645?

CVE-2017-5645 is a critical-severity flaw in Log4j from Apache, published on 17 April 2017. 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-2017-5645?

It scores 9.8 out of 10 on the CVSS severity scale, which is critical. Our risk score for CVE-2017-5645 is 77 out of 100, which is High. Its action is "Patch now". Not confirmed as exploited yet, but serious or likely enough that it should not wait for a quiet month.

### Is CVE-2017-5645 being exploited?

It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 90%. That can change at any time, which is why we keep watching.

### Which versions does CVE-2017-5645 affect?

For Log4j from Apache: 2.0 to before 2.8.2. The record lists 79 products in all, each with its versions, under "Who is affected" on this page.

### How do I fix CVE-2017-5645?

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.

## Does CVE-2017-5645 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
Book a demo: https://www.precursorintelligence.com/contact