CVE-2025-66614
Apache Tomcat - Client certificate verification bypass
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.
How to fix CVE-2025-66614
To remediate CVE-2025-66614, upgrade the affected package to a fixed version below.
- —upgrade to 9.0.113 or later
- —upgrade to 10.1.52-1~deb12u1 or later
- —upgrade to 11.0.15-1~deb13u1 or later
- —upgrade to 9.0.70-2 or later
- —upgrade to 11.0.15 or later
- —upgrade to 11.0.15 or later
- —upgrade to 11.0.15 or later
- —upgrade to 11.0.15 or later
Is CVE-2025-66614 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (8)
- >= 8.5.0, < 9.0.113, >= 10.1.0, < 10.1.50, >= 11.0.0, < 11.0.15
- from 0, < 10.1.52-1~deb12u1
- from 0, < 11.0.15-1~deb13u1
- from 0, < 9.0.70-2
- >= 11.0.0-M1, < 11.0.15
- >= 11.0.0-M1, < 11.0.15
- >= 11.0.0-M1, < 11.0.15
- >= 11.0.0-M1, < 11.0.15
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | CRITICAL9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |