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Moderate severityNVD Advisory· Published Feb 17, 2026· Updated Mar 24, 2026

Apache Tomcat: Client certificate verification bypass due to virtual host mapping

CVE-2025-66614

Description

Improper Input Validation vulnerability.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.14, from 10.1.0-M1 through 10.1.49, from 9.0.0-M1 through 9.0.112.

The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 through 8.5.100. Older EOL versions are not affected. Tomcat did not validate that the host name provided via the SNI extension was the same as the host name provided in the HTTP host header field. If Tomcat was configured with more than one virtual host and the TLS configuration for one of those hosts did not require client certificate authentication but another one did, it was possible for a client to bypass the client certificate authentication by sending different host names in the SNI extension and the HTTP host header field.

The vulnerability only applies if client certificate authentication is only enforced at the Connector. It does not apply if client certificate authentication is enforced at the web application.

Users are recommended to upgrade to version 11.0.15 or later, 10.1.50 or later or 9.0.113 or later, which fix the issue.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 11.0.0-M1, < 11.0.1511.0.15
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 10.1.0-M1, < 10.1.5010.1.50
org.apache.tomcat.embed:tomcat-embed-coreMaven
< 9.0.1139.0.113
org.apache.tomcat:tomcatMaven
>= 11.0.0-M1, < 11.0.1511.0.15
org.apache.tomcat:tomcatMaven
>= 10.1.0-M1, < 10.1.5010.1.50
org.apache.tomcat:tomcatMaven
< 9.0.1139.0.113
org.apache.tomcat:tomcat-coyoteMaven
>= 11.0.0-M1, < 11.0.1511.0.15
org.apache.tomcat:tomcat-coyoteMaven
>= 10.1.0-M1, < 10.1.5010.1.50
org.apache.tomcat:tomcat-coyoteMaven
< 9.0.1139.0.113

Affected products

59

Patches

Vulnerability mechanics

References

12

News mentions

1