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Actively exploitedKnown ransomware use

CVE-2017-12615 Apache Tomcat on Windows Remote Code Execution Vulnerability

When running Apache Tomcat on Windows with HTTP PUTs enabled, it is 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.

From the CISA KEV catalogue version 2026.11.06, with Cybergen analysis. Updated 6 Nov 2026.

Our Assessment

Should You Worry?

Patch nowCybergen assessment
  • CISA confirmed exploitation in the wild and added it to the Known Exploited Vulnerabilities catalogue on 25 Mar 2022.
  • CISA lists it as known to be used in ransomware campaigns.
  • Rated High severity (CVSS 8.1, scored by CISA).
  • It has been in the catalogue for 1,687 days. Systems still unpatched now have almost certainly been scanned for it.
The Vulnerability

What It Is

When running Apache Tomcat 7.0.0 to 7.0.79 on Windows with HTTP PUTs enabled (e.g. via setting the readonly initialisation parameter of the Default 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.

Affected Versions

ProductVersions
Apache Software Foundation Apache Tomcat7.0.0 to 7.0.79

From the public CVE record, as supplied by the vendor. Always confirm against the vendor advisory.

From Watch to Action

What To Do Now

  1. 1

    Find it

    Search your asset inventory and external attack surface for Apache Tomcat. Include cloud images, appliances and anything a supplier runs for you.

    Attack Surface Management
  2. 2

    Fix it

    Apply updates per vendor instructions.

    Vulnerability Management
  3. 3

    Hunt for compromise

    If an affected system was reachable before you patched, assume it may have been hit. Check logs, new accounts, web shells and outbound connections from the date of exposure.

    Incident Response
  4. 4

    Prove it is fixed

    Rescan or test the system after patching. Upgrades that fail silently and forgotten secondary instances are common.

    Penetration Testing

Vendor Advisories

Regulation

The Compliance Clock

Cyber EssentialsRated high, so if it affects devices in your Cyber Essentials scope, the update must be installed within 14 days of the vendor releasing it.NIS2If exploitation causes a significant incident, essential and important entities owe their CSIRT an early warning within 24 hours and a notification within 72 hours.DORAFinancial entities must classify ICT incidents and send an initial notification for a major incident within strict deadlines, with exploited flaws a common cause.US federal (BOD 22-01)Federal civilian agencies had until 15 Apr 2022 to remediate. A sensible benchmark for everyone else.

General guidance, not legal advice. Your obligations depend on your sector, scope and jurisdiction.

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Evidence

Sources

  1. CISA Known Exploited Vulnerabilities catalogue
  2. NVD: CVE-2017-12615
  3. CVE record: CVE-2017-12615
  4. FIRST EPSS
  5. access.redhat.com/errata/RHSA-2017:3113
  6. access.redhat.com/errata/RHSA-2017:3080
  7. securitytracker.com/id/1039392
  8. lists.apache.org/thread.html/8fcb1e2d5895413abcf266f011b9918ae03e0b7daceb118ffbf23f8c%40%3Cannounce.
  9. synology.com/support/security/Synology_SA_17_54_Tomcat
  10. access.redhat.com/errata/RHSA-2018:0465
  11. breaktoprotect.blogspot.com/2017/09/the-case-of-cve-2017-12615-tomcat-7-put.html
  12. access.redhat.com/errata/RHSA-2017:3114