Apache Tomcat: Bypass of rules in Rewrite Valve
48Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 9.8epss 4.0%
from disclosure to weapon0 days
Published on NVDApr 28
1st PoCApr 8
exploitation probability
4.0%top 10% of all CVEs
observed exploitation
nono source reports it
2 public exploit(s)
Improper Neutralization of Escape, Meta, or Control Sequences vulnerability in Apache Tomcat. 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.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.5, from 10.1.0-M1 through 10.1.39, from 9.0.0.M1 through 9.0.102.
The following versions were EOL at the time the CVE was created but are
known to be affected: 8.5.0 though 8.5.100. Other, older, EOL versions
may also be affected.
Users are recommended to upgrade to version [FIXED_VERSION], which fixes the issue.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Apache Software Foundation · Apache Tomcatpublic PoCs found — 2
githubgithub.com/gregk4sec/CVE-2025-31651-o★ 2githubgithub.com/gregk4sec/cve-2025-31651★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.