CVE-2025-66220CWE-170

CVE-2025-66220

Medium · published December 4, 2025

CVSS v3.1
5.0
EPSS
0%
Percentile
5.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.0 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00168 · 5.8th percentile
Weakness
CWE-170 · Improper Null Termination
Published
2025-12-04T00:15Z
Affected products (4)
ProductVersionsFixed in
envoyproxy/envoy< 1.33.131.33.13
envoyproxy/envoy≥ 1.34.0, < 1.34.111.34.11
envoyproxy/envoy≥ 1.35.0, < 1.35.71.35.7
envoyproxy/envoy≥ 1.36.0, < 1.36.31.36.3
References (1)
https://github.com/envoyproxy/envoy/security/advisories/GHSA-rwjg-c3h2-f57p · [email protected]
EPSS history
Timeline
  • 03 DEC 18:31Z
    Envoy’s TLS certificate matcher for `match_typed_subject_alt_names` may incorrectly treat certificates containing an embedded null byte
    cvelistv5