CVE-2025-66220

Dec. 5, 2025, 3:44 p.m.

5.0
Medium

Description

Envoy is a high-performance edge/middle/service proxy. In 1.33.12, 1.34.10, 1.35.6, 1.36.2, and earlier, Envoy’s mTLS certificate matcher for match_typed_subject_alt_names may incorrectly treat certificates containing an embedded null byte (\0) inside an OTHERNAME SAN value as valid matches.

Product(s) Impacted

Vendor Product Versions
Envoyproxy
  • Envoy
  • *

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-170
Improper Null Termination
The product does not terminate or incorrectly terminates a string or array with a null character or equivalent terminator.

*CPE(s)

Affected systems and software identified for this CVE.

Type Vendor Product Version Update Edition Language Software Edition Target Software Target Hardware Other Information
a envoyproxy envoy / / / / / / / /
a envoyproxy envoy / / / / / / / /
a envoyproxy envoy / / / / / / / /
a envoyproxy envoy / / / / / / / /

References

https://github.com/envoyproxy/envoy/security/advisories/GHSA-rwjg-c3h2-f57p

Tags

security-advisories@github.com
CWE-170
2025-12-03
CVE-2025-66220

CVSS Score

5.0 / 10

CVSS Data - 3.1

  • Attack Vector: NETWORK
  • Attack Complexity: HIGH
  • Privileges Required: HIGH
  • Scope: UNCHANGED
  • Confidentiality Impact: HIGH
  • Integrity Impact: LOW
  • Availability Impact: NONE

    • CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:L/A:N

    View Vector String

Timeline

Published: Dec. 3, 2025, 7:15 p.m.
Last Modified: Dec. 5, 2025, 3:44 p.m.

Status : Analyzed

CVE has had analysis completed and all data associations made.

More info

Source

security-advisories@github.com

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.