CVE-2025-31651 Apache Tomcat - Rewrite rule bypass
Severity: Low
Vendor: The Apache Software Foundation
Versions Affected:
Apache Tomcat 11.0.0-M1 to 11.0.5
Apache Tomcat 10.1.0-M1 to 10.1.39
Apache Tomcat 9.0.0.M1 to 9.0.102
Description:
For a subset of unlikely rewrite rule configurations, it was possible
for a specially crafted request to bypass some rewrite rules. If those
rewrite rules effectively enforced security constraints, those
constraints could be bypassed.
Mitigation:
Users of the affected versions should apply one of the following
mitigations:
- Upgrade to Apache Tomcat 11.0.6 or later
- Upgrade to Apache Tomcat 10.1.40 or later
- Upgrade to Apache Tomcat 9.0.104 or later
Note: This issue was fixed in Apache Tomcat 9.0.103 but the release vote
for the 9.0.103 release candidate did not pass. Therefore, although
users must download 9.0.104 to obtain a version that includes a fix for
this issue, version 9.0.103 is not included in the list of affected
versions.
Credit:
The vulnerability was identified by COSCO Shipping Lines DIC.
History:
2025-04-28 Original advisory
References:
[1] https://tomcat.apache.org/security-11.html
[2] https://tomcat.apache.org/security-10.html
[3] https://tomcat.apache.org/security-9.html
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