# What is CVE-2017-12617?

> CVE-2017-12617 is a high-severity flaw (CVSS 8.1) in Tomcat from Apache, published on 4 October 2017. 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-2017-12617

## 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:** 75 out of 100 (High); action: Emergency patch. Kept up to date as the evidence changes.
- **Severity:** High (CVSS 8.1 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:** 4 October 2017
- **Record last updated:** 22 October 2025
- **Main product:** Tomcat from Apache
- **Affected products:** 58

## What is CVE-2017-12617? 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

When running Apache Tomcat versions 9.0.0.M1 to 9.0.0, 8.5.0 to 8.5.22, 8.0.0.RC1 to 8.0.46 and 7.0.0 to 7.0.81 with HTTP PUTs enabled (e.g. via setting the readonly initialisation parameter of the Default servlet to false) it was possible to upload a JSP file to the server via a specially crafted request. This JSP could then be requested and any code it contained would be executed by the server.

### What kind of flaw is it?

- CWE-434: Unrestricted Upload of File with Dangerous Type

### How an attack on it works

- Where an attacker can be: Anywhere on the internet
- How hard it is to pull off: Hard: conditions must line up
- 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:H/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Is CVE-2017-12617 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

- 4 October 2017: Published
- 22 October 2025: Record last updated

### How Precursor Intelligence ranks it

CVE-2017-12617 scores **75 out of 100 (High)**, 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-2017-12617?

The published record lists 58 products. Versions are as published: "7.0.0 to before 7.0.82" means from 7.0.0 up to, but not including, 7.0.82.

- [Tomcat](https://www.precursorintelligence.com/product/apache/tomcat) by [Apache](https://www.precursorintelligence.com/vendors/apache) (Application): 7.0.0 to before 7.0.82, 8.0 to before 8.0.47, 8.5.0 to before 8.5.23, 9.0.0 to before 9.0.1
- [Retail Invoice Matching](https://www.precursorintelligence.com/product/oracle/retail_invoice_matching) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 12.0, 13.0, 13.1, 13.2, 14.0, 14.1, 15.0, 16.0
- [Retail Price Management](https://www.precursorintelligence.com/product/oracle/retail_price_management) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 12.0, 13.0, 13.1, 13.2, 14.0, 14.1, 15.0, 16.0
- [Retail Store Inventory Management](https://www.precursorintelligence.com/product/oracle/retail_store_inventory_management) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 12.0.12, 13.0.7, 13.1.9, 13.2.9, 14.0.4, 14.1.3, 15.0.2, 16.0.1
- [Transportation Management](https://www.precursorintelligence.com/product/oracle/transportation_management) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 6.3.1, 6.3.2, 6.3.3, 6.3.4, 6.3.5, 6.3.6, 6.3.7
- [Micros Retail Xbri Loss Prevention](https://www.precursorintelligence.com/product/oracle/micros_retail_xbri_loss_prevention) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 10.0.1, 10.5.0, 10.6.0, 10.7.0, 10.8.0, 10.8.1
- [Retail Order Broker](https://www.precursorintelligence.com/product/oracle/retail_order_broker) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 5.0, 5.1, 5.2, 15.0, 16.0
- [Agile Plm](https://www.precursorintelligence.com/product/oracle/agile_plm) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 9.3.3, 9.3.4, 9.3.5, 9.3.6
- [Enterprise Linux Eus](https://www.precursorintelligence.com/product/redhat/enterprise_linux_eus) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 7.4, 7.5, 7.6, 7.7
- [Enterprise Linux Eus Compute Node](https://www.precursorintelligence.com/product/redhat/enterprise_linux_eus_compute_node) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 7.4, 7.5, 7.6, 7.7
- [Enterprise Linux for Ibm Z Systems Eus](https://www.precursorintelligence.com/product/redhat/enterprise_linux_for_ibm_z_systems_eus) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 7.4_s390x, 7.5_s390x, 7.6_s390x, 7.7_s390x
- [Enterprise Linux for Power Big Endian Eus](https://www.precursorintelligence.com/product/redhat/enterprise_linux_for_power_big_endian_eus) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 7.4_ppc64, 7.5_ppc64, 7.6_ppc64, 7.7_ppc64
- [Enterprise Linux for Power Little Endian Eus](https://www.precursorintelligence.com/product/redhat/enterprise_linux_for_power_little_endian_eus) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 7.4_ppc64le, 7.5_ppc64le, 7.6_ppc64le, 7.7_ppc64le
- [Retail Advanced Inventory Planning](https://www.precursorintelligence.com/product/oracle/retail_advanced_inventory_planning) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 13.2, 13.4, 14.1, 15.0
- [Retail Insights](https://www.precursorintelligence.com/product/oracle/retail_insights) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 14.0, 14.1, 15.0, 16.0
- [Retail Order Management System](https://www.precursorintelligence.com/product/oracle/retail_order_management_system) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 4.0, 4.5, 4.7, 5.0
- [Retail Returns Management](https://www.precursorintelligence.com/product/oracle/retail_returns_management) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 2.3.8, 2.4.9, 14.0.4, 14.1.3
- [Retail Xstore Point of Service](https://www.precursorintelligence.com/product/oracle/retail_xstore_point_of_service) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 6.0.11, 7.0.6, 7.1.6, 15.0.1
- [Ubuntu Linux](https://www.precursorintelligence.com/product/canonical/ubuntu_linux) by [Canonical](https://www.precursorintelligence.com/vendors/canonical) (Operating system): 12.04, 16.04, 17.10, 18.04
- [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, 7.7
- [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, 7.7
- [Mysql Enterprise Monitor](https://www.precursorintelligence.com/product/oracle/mysql_enterprise_monitor) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): up to 3.3.6.3293, 3.4.0 to 3.4.4.4226, 4.0.0 to 4.0.0.5135
- [Retail Eftlink](https://www.precursorintelligence.com/product/oracle/retail_eftlink) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 1.1.124, 15.0.1, 16.0.2
- [Active Iq Unified Manager](https://www.precursorintelligence.com/product/netapp/active_iq_unified_manager) by [Netapp](https://www.precursorintelligence.com/vendors/netapp) (Application): 7.3 and later, 9.5 and later
- [Endeca Information Discovery Integrator](https://www.precursorintelligence.com/product/oracle/endeca_information_discovery_integrator) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 3.1.0, 3.2.0
- [Enterprise Linux Desktop](https://www.precursorintelligence.com/product/redhat/enterprise_linux_desktop) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 6.0, 7.0
- [Enterprise Linux for Ibm Z Systems](https://www.precursorintelligence.com/product/redhat/enterprise_linux_for_ibm_z_systems) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 6.0_s390x, 7.0_s390x
- [Enterprise Linux for Power Big Endian](https://www.precursorintelligence.com/product/redhat/enterprise_linux_for_power_big_endian) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 6.0_ppc64, 7.0_ppc64
- [Enterprise Linux Server](https://www.precursorintelligence.com/product/redhat/enterprise_linux_server) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 6.0, 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): 6.0, 7.0
- [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 7.3.5.3.0, 8.0.0.0.0 to 8.0.9.0.0
- [Fmw Platform](https://www.precursorintelligence.com/product/oracle/fmw_platform) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 12.2.1.2.0, 12.2.1.3.0
- [Hospitality Guest Access](https://www.precursorintelligence.com/product/oracle/hospitality_guest_access) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 4.2.0, 4.2.1
- [Instantis Enterprisetrack](https://www.precursorintelligence.com/product/oracle/instantis_enterprisetrack) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 17.1, 17.2
- [Jboss Enterprise Application Platform](https://www.precursorintelligence.com/product/redhat/jboss_enterprise_application_platform) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Application): 6.0.0, 6.4.0
- [Jboss Enterprise Web Server](https://www.precursorintelligence.com/product/redhat/jboss_enterprise_web_server) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Application): 2.0.0, 3.0.0
- [Retail Back Office](https://www.precursorintelligence.com/product/oracle/retail_back_office) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 14.0.4, 14.1.3
- [Retail Central Office](https://www.precursorintelligence.com/product/oracle/retail_central_office) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 14.0.4, 14.1.3
- [Retail Point-of-Service](https://www.precursorintelligence.com/product/oracle/retail_point-of-service) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 14.0.4, 14.1.3
- [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
- [Debian Linux](https://www.precursorintelligence.com/product/debian/debian_linux) by [Debian](https://www.precursorintelligence.com/vendors/debian) (Operating system): 7.0
- [Element](https://www.precursorintelligence.com/product/netapp/element) by [Netapp](https://www.precursorintelligence.com/vendors/netapp) (Operating system): version not specified
- [Enterprise Linux for Power Little Endian](https://www.precursorintelligence.com/product/redhat/enterprise_linux_for_power_little_endian) 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): 12.1.0.4.0
- [Fuse](https://www.precursorintelligence.com/product/redhat/fuse) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Application): 1.0
- [Health Sciences Empirica Inspections](https://www.precursorintelligence.com/product/oracle/health_sciences_empirica_inspections) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 1.0.1.1
- [Jboss Enterprise Web Server Text-Only Advisories](https://www.precursorintelligence.com/product/redhat/jboss_enterprise_web_server_text-only_advisories) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Application): version not specified
- [Management Pack](https://www.precursorintelligence.com/product/oracle/management_pack) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 11.2.1.0.13
- [Micros Lucas](https://www.precursorintelligence.com/product/oracle/micros_lucas) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 2.9.5
- [Oncommand Balance](https://www.precursorintelligence.com/product/netapp/oncommand_balance) 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 Shift](https://www.precursorintelligence.com/product/netapp/oncommand_shift) 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
- [Retail Convenience and Fuel Pos Software](https://www.precursorintelligence.com/product/oracle/retail_convenience_and_fuel_pos_software) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 2.1.132
- [Snapcenter](https://www.precursorintelligence.com/product/netapp/snapcenter) by [Netapp](https://www.precursorintelligence.com/vendors/netapp) (Application): version not specified
- [Tuxedo System and Applications Monitor](https://www.precursorintelligence.com/product/oracle/tuxedo_system_and_applications_monitor) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 12.1.3.0.0
- [Webcenter Sites](https://www.precursorintelligence.com/product/oracle/webcenter_sites) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 11.1.1.8.0
- [Workload Manager](https://www.precursorintelligence.com/product/oracle/workload_manager) by [Oracle](https://www.precursorintelligence.com/vendors/oracle) (Application): 12.2.0.1

## How do I fix CVE-2017-12617?

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

- [oracle.com](http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html) (Patch, Third-party advisory)
- [oracle.com](http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html) (Patch, Third-party advisory)
- [oracle.com](http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html) (Patch, Third-party advisory)
- [lists.apache.org](https://lists.apache.org/thread.html/1dd0a59c1295cc08ce4c9e7edae5ad2268acc9ba55adcefa0532e5ba%40%3Cdev.tomcat.apache.org%3E) (Mailing list, Patch)
- [lists.apache.org](https://lists.apache.org/thread.html/343558d982879bf88ec20dbf707f8c11255f8e219e81d45c4f8d0551%40%3Cdev.tomcat.apache.org%3E) (Mailing list, Patch)
- [lists.apache.org](https://lists.apache.org/thread.html/388a323769f1dff84c9ec905455aa73fbcb20338e3c7eb131457f708%40%3Cdev.tomcat.apache.org%3E) (Mailing list, Patch)
- [lists.apache.org](https://lists.apache.org/thread.html/3d19773b4cf0377db62d1e9328bf9160bf1819f04f988315086931d7%40%3Cdev.tomcat.apache.org%3E) (Mailing list, Patch)
- [lists.apache.org](https://lists.apache.org/thread.html/5c0e00fd31efc11e147bf99d0f03c00a734447d3b131ab0818644cdb%40%3Cdev.tomcat.apache.org%3E) (Mailing list, Patch)
- [lists.apache.org](https://lists.apache.org/thread.html/6af47120905aa7d8fe12f42e8ff2284fb338ba141d3b77b8c7cb61b3%40%3Cdev.tomcat.apache.org%3E) (Mailing list, Patch)
- [lists.apache.org](https://lists.apache.org/thread.html/845312a10aabbe2c499fca94003881d2c79fc993d85f34c1f5c77424%40%3Cdev.tomcat.apache.org%3E) (Mailing list, Patch)
- [lists.apache.org](https://lists.apache.org/thread.html/88855876c33f2f9c532ffb75bfee570ccf0b17ffa77493745af9a17a%40%3Cdev.tomcat.apache.org%3E) (Mailing list, Patch)
- [lists.apache.org](https://lists.apache.org/thread.html/b5e3f51d28cd5d9b1809f56594f2cf63dcd6a90429e16ea9f83bbedc%40%3Cdev.tomcat.apache.org%3E) (Mailing list, Patch)
- [lists.apache.org](https://lists.apache.org/thread.html/e85e83e9954f169bbb77b44baae5a33d8de878df557bb32b7f793661%40%3Cdev.tomcat.apache.org%3E) (Mailing list, Patch)
- [lists.apache.org](https://lists.apache.org/thread.html/eb6efa8d59c45a7a9eff94c4b925467d3b3fec8ba7697f3daa314b04%40%3Cdev.tomcat.apache.org%3E) (Mailing list, Patch)
- [lists.apache.org](https://lists.apache.org/thread.html/r3bbb800a816d0a51eccc5a228c58736960a9fffafa581a225834d97d%40%3Cdev.tomcat.apache.org%3E) (Mailing list, Patch)
- [lists.apache.org](https://lists.apache.org/thread.html/r48c1444845fe15a823e1374674bfc297d5008a5453788099ea14caf0%40%3Cdev.tomcat.apache.org%3E) (Mailing list, Patch)
- [lists.apache.org](https://lists.apache.org/thread.html/r6ccee4e849bc77df0840c7f853f6bd09d426f6741247da2b7429d5d9%40%3Cdev.tomcat.apache.org%3E) (Mailing list, Patch)
- [lists.apache.org](https://lists.apache.org/thread.html/r9136ff5b13e4f1941360b5a309efee2c114a14855578c3a2cbe5d19c%40%3Cdev.tomcat.apache.org%3E) (Mailing list, Patch)
- [lists.apache.org](https://lists.apache.org/thread.html/raba0fabaf4d56d4325ab2aca8814f0b30a237ab83d8106b115ee279a%40%3Cdev.tomcat.apache.org%3E) (Mailing list, Patch)
- [oracle.com](https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html) (Patch, Third-party advisory)
- [securityfocus.com](http://www.securityfocus.com/bid/100954) (Third-party advisory, Vulnerability database)
- [securitytracker.com](http://www.securitytracker.com/id/1039552) (Third-party advisory, Vulnerability database)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:3080) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:3081) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:3113) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2017:3114) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2018:0268) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2018:0269) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2018:0270) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2018:0271) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2018:0275) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2018:0465) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2018:0466) (Third-party advisory)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2018:2939) (Third-party advisory)
- [lists.apache.org](https://lists.apache.org/thread.html/3fd341a604c4e9eab39e7eaabbbac39c30101a022acc11dd09d7ebcb%40%3Cannounce.tomcat.apache.org%3E) (Issue tracking, Mailing list)
- [lists.debian.org](https://lists.debian.org/debian-lts-announce/2017/11/msg00009.html) (Mailing list, Third-party advisory)
- [security.netapp.com](https://security.netapp.com/advisory/ntap-20171018-0002/) (Third-party advisory)
- [security.netapp.com](https://security.netapp.com/advisory/ntap-20180117-0002/) (Third-party advisory)
- [support.f5.com](https://support.f5.com/csp/article/K53173544) (Third-party advisory)
- [support.hpe.com](https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03812en_us) (Third-party advisory)
- [support.hpe.com](https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03828en_us) (Third-party advisory)
- [usn.ubuntu.com](https://usn.ubuntu.com/3665-1/) (Third-party advisory)
- [exploit-db.com](https://www.exploit-db.com/exploits/42966/) (Exploit, Third-party advisory, Vulnerability database)
- [exploit-db.com](https://www.exploit-db.com/exploits/43008/) (Exploit, Third-party advisory, Vulnerability database)

## Questions

### What is CVE-2017-12617?

CVE-2017-12617 is a high-severity flaw in Tomcat from Apache, published on 4 October 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-2017-12617?

It scores 8.1 out of 10 on the CVSS severity scale, which is high. Our risk score for CVE-2017-12617 is 75 out of 100, which is High. 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-2017-12617 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-2017-12617 affect?

For Tomcat from Apache: 7.0.0 to before 7.0.82, 8.0 to before 8.0.47, 8.5.0 to before 8.5.23, 9.0.0 to before 9.0.1. The record lists 58 products in all, each with its versions, under "Who is affected" on this page.

### How do I fix CVE-2017-12617?

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-2017-12617 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.

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