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Understanding and Mitigating CVE-2025-31651 in Apache Tomcat

Overview

The vulnerability "CVE-2025-31651" affects Apache Tomcat versions 9.0.0-M1 through 9.0.102, 10.1.0-M1 through 10.1.39, and 11.0.0-M1 through 11.0.5, allowing specially crafted requests to bypass security constraints. The customer's system, running Tomcat 7.0.109, is not affected as it is outside the vulnerable range and lacks rewrite configurations. This issue is considered an OS-level vulnerability under RedHat's scope.

Information

Vulnerability: CVE-2025-31651 in Apache Tomcat

Affected Versions:

  • Tomcat 9.0.0-M1 through 9.0.102
  • Tomcat 10.1.0-M1 through 10.1.39
  • Tomcat 11.0.0-M1 through 11.0.5
  • EOL versions 8.5.0 through 8.5.100

Resolution Steps:

  1. Verify Tomcat Version:
    • Run version.sh to check your Tomcat version.
    • Ensure your version is not within the affected range.
  2. Check for Rewrite Configurations: 
    
grep -R --line-number -E "RewriteValve|org\.apache\.catalina\.valves\.rewrite" conf/ webapps/
find conf/ -type f -name rewrite.config
find webapps/ -type f -path "*/WEB-INF/rewrite.config"
    • Confirm no rewrite configurations are present.
  3. Review RedHat's Advisory: 
  4. Confirm Non-Impact: 
    • If your Tomcat version is outside the affected range and no rewrite configurations are found, your system is not impacted by this vulnerability.

Note: This vulnerability is considered an OS-level issue, and any necessary patches would be under RedHat's scope.

Frequently Asked Questions

How do I know if my system is affected by CVE-2025-31651?
Check your Tomcat version using version.sh. If your version is within 9.0.0-M1 to 9.0.102, 10.1.0-M1 to 10.1.39, or 11.0.0-M1 to 11.0.5, you may be affected. Also, search for any rewrite configurations using the provided commands.
What should I do if my system is affected by this vulnerability?
Upgrade to a patched version of Tomcat (e.g., 9.0.104+, 10.1.40+, or 11.0.6+). Review and verify rewrite rule configurations post-update and monitor for anomalous HTTP requests.
Is this vulnerability related to the operating system?
Yes, CVE-2025-31651 is considered an OS-level vulnerability, and any necessary patches would be under RedHat's scope. Check RedHat's advisory for more details.
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  1. Mohammed Amer

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