CVE-2025-66614Network attack vector

Authentication bypass via mismatched SNI and Host

Published Feb 17, 2026 · Updated Feb 17, 2026

Authentication bypass in affected Apache Tomcat releases allows remote attackers to access client-certificate-protected virtual hosts. The Connector selected TLS authentication by SNI but routed the request using an unmatched HTTP Host name without verifying equivalent SSL configurations. Exploitation requires multiple virtual hosts with client certificates enforced only at the Connector; web-application enforcement is unaffected.

CVSS severity9.1
Critical
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in affected Apache Tomcat releases allows remote attackers to access client-certificate-protected virtual hosts. The Connector selected TLS authentication by SNI but routed the request using an unmatched HTTP Host name without verifying equivalent SSL configurations. Exploitation requires multiple virtual hosts with client certificates enforced only at the Connector; web-application enforcement is unaffected.

The record

CVE
CVE-2025-66614
Published
Feb 17, 2026
Updated
Feb 17, 2026
Vendor
The Apache Software Foundation
Product
Apache Tomcat
Classifications
CWE-20, CWE-295, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.1.0-M1 <=10.1.49
  2. Affected versionversion=11.0.0-M1 <=11.0.14
  3. Affected versionversion=8.5.0 <=8.5.100
  4. Affected versionversion=9.0.0-M1 <=9.0.112

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Tomcatversion=10.1.0-M1 <=10.1.49; version=11.0.0-M1 <=11.0.14; version=8.5.0 <=8.5.100; version=9.0.0-M1 <=9.0.112

Published CVSS scores

6.3GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
9.1NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
7.6CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-295Improper Certificate Validation
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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