CVE-2025-66614 Details
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.
View at NVD
Exploit prediction scoring system (EPSS) score for CVE-2025-66614
EPSS (Exploit Prediction Scoring System): EPSS predicts the likelihood that a vulnerability will be exploited in the wild. A higher percentage means a greater chance of an exploit occurring. The EPSS model produces a probability score between 0 and 1 (0 and 100%).
0.04 Probability of exploitation activity being observed over the next 30 days (13th percentile)
CVSS score for CVE-2025-66614
CVSS (Common Vulnerability Scoring System): An open framework owned and managed by FIRST.Org, Inc. that assigns a numerical score from 0 to 10 to software vulnerabilities to indicate their severity.
9.1 Critical
Products affected by CVE-2025-66614
Tomcat 11.0.1
Tomcat 11.0.2
Tomcat 9.0.0
Tomcat 9.0.1
Tomcat 9.0.10
DVE Score by Bitsight AI
DVE scores complement traditional static scoring systems like CVSS with Bitsight AI powered real-time threat intelligence and underground cyber criminal activity so that security teams can reduce alert fatigue and focus on vulnerabilities most likely to be exploited.
Medium
More on DVE scores

CVE-2025-66614 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 11,877 28.32%
CN 7,481 17.84%
IN 2,604 6.21%
DE 2,250 5.37%
KR 1,440 3.43%
BR 1,425 3.40%
JP 1,152 2.75%
SG 1,029 2.45%
FR 934 2.23%
GB 918 2.19%

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CVE-2025-66614 Industry Footprint

Top 10 Identified Industries

*Service provider organizations (typically Technology and Telecommunications) are disproportionally represented in the results given their upstream ownership of end-user infrastructure. See our FAQs.

Industry* Observations Percentage
Technology 24,948 77.37%
Telecommunications 4,703 14.58%
Education 894 2.77%
Government/Politics 350 1.09%
Finance 271 0.84%
Business Services 242 0.75%
Manufacturing 156 0.48%
Healthcare/Wellness 131 0.41%
Retail 109 0.34%
Transportation 64 0.20%

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