Vigie VulnDBEuropean-hosted Vulnerability DB

CVE-2025-66220

Envoy’s TLS certificate matcher for `match_typed_subject_alt_names` may incorrectly treat certificates containing an embedded null byte

At a glance

Severity
MEDIUM 5.0
EPSS
EPSS 0.17 % · percentile 6 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
GitHub_M
NVD status
Analyzed

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.

Scores

VersionScoreVectorScored by
CVSS 3.1MEDIUM 5.0CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:L/A:NGitHub_M
CVSS 3.1MEDIUM 5.0CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:L/A:NNVD · security-advisories@github.com (Secondary)
CVSS 3.1HIGH 7.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:NNVD · nvd@nist.gov (Primary)

Weaknesses (CWE)

Advisories

European references

Affected configurations (NVD CPE)

Affected products

ProductVersions
envoyproxy · envoyaffected >= 1.36.0, <= 1.36.2 ; affected >= 1.35.0, <= 1.35.6 ; affected >= 1.34.0, <= 1.34.10 ; affected <= 1.33.12

References

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD