CVE-2025-66614 (GCVE-0-2025-66614)

Vulnerability from cvelistv5 – Published: 2026-02-17 18:48 – Updated: 2026-03-24 09:46
VLAI?
Title
Apache Tomcat: Client certificate verification bypass due to virtual host mapping
Summary
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.
Severity ?
No CVSS data available.
CWE
  • CWE-20 - Improper Input Validation
Assigner
References
Impacted products
Vendor Product Version
Apache Software Foundation Apache Tomcat Affected: 11.0.0-M1 , ≤ 11.0.14 (semver)
Affected: 10.1.0-M1 , ≤ 10.1.49 (semver)
Affected: 9.0.0-M1 , ≤ 9.0.112 (semver)
Affected: 8.5.0 , ≤ 8.5.100 (semver)
Unaffected: 0 , < 8.5.0 (semver)
Create a notification for this product.
Credits
Sven Hebrok, Willi Hensch, Felix Cramer, Tim Leonhard Storm, Maximilian Radoy, and Juraj Somorovsky from Paderborn University
Show details on NVD website
To clipboard 

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Older EOL versions are not affected.\\nTomcat did not validate that the host name provided via the SNI \\nextension was the same as the host name provided in the HTTP host header \\nfield. If Tomcat was configured with more than one virtual host and the \\nTLS configuration for one of those hosts did not require client \\ncertificate authentication but another one did, it was possible for a \\nclient to bypass the client certificate authentication by sending \\ndifferent host names in the SNI extension and the HTTP host header field.\\n\\n\\n\\nThe vulnerability only applies if client certificate authentication is \\nonly enforced at the Connector. It does not apply if client certificate \\nauthentication is enforced at the web application.\\n\\n\\nUsers 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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eImproper Input Validation vulnerability.\u003c/p\u003e\u003cp\u003eThis 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.\u003c/p\u003eThe following versions were EOL at the time the CVE was created but are \\nknown to be affected: 8.5.0 through 8.5.100. Older EOL versions are not affected.\u003cbr\u003e\u003cp\u003eTomcat did not validate that the host name provided via the SNI \\nextension was the same as the host name provided in the HTTP host header \\nfield. If Tomcat was configured with more than one virtual host and the \\nTLS configuration for one of those hosts did not require client \\ncertificate authentication but another one did, it was possible for a \\nclient to bypass the client certificate authentication by sending \\ndifferent host names in the SNI extension and the HTTP host header field.\\n\u003cbr\u003e\\n\u003cbr\u003eThe vulnerability only applies if client certificate authentication is \\nonly enforced at the Connector. It does not apply if client certificate \\nauthentication is enforced at the web application.\u003cbr\u003e\u003c/p\u003e\u003cp\u003eUsers 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.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-20\", \"description\": \"CWE-20 Improper Input Validation\"}]}], \"providerMetadata\": {\"orgId\": \"f0158376-9dc2-43b6-827c-5f631a4d8d09\", \"shortName\": \"apache\", \"dateUpdated\": \"2026-03-24T09:46:33.159Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-66614\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-03-24T09:46:33.159Z\", \"dateReserved\": \"2025-12-05T11:54:31.778Z\", \"assignerOrgId\": \"f0158376-9dc2-43b6-827c-5f631a4d8d09\", \"datePublished\": \"2026-02-17T18:48:30.577Z\", \"assignerShortName\": \"apache\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.