EUVD-2026-21059
GHSA-24j9-x2wg-9qv6
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Lifecycle Timeline
4Description
CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled and FFM is used in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M14 through 11.0.20, from 10.1.22 through 10.1.53, from 9.0.92 through 9.0.116. Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117, which fixes the issue.
Analysis
CLIENT_CERT authentication bypass in Apache Tomcat allows unauthenticated remote attackers to bypass certificate-based authentication when soft fail is disabled and Foreign Function Memory (FFM) is enabled, affecting Tomcat 9.0.92-9.0.116, 10.1.22-10.1.53, and 11.0.0-M14-11.0.20. The vulnerability has a CVSS score of 6.5 with high confidentiality impact and partial integrity impact; however, the EPSS score of 0.04% (11th percentile) indicates very low real-world exploitation probability, and no public exploit code or confirmed active exploitation has been identified.
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