{"id":"CVE-2025-66220","aliases":["BIT-envoy-2025-66220","GHSA-rwjg-c3h2-f57p"],"url":"https://o3.security/vulnerability/CVE-2025-66220","summary":"Envoy’s TLS certificate matcher for `match_typed_subject_alt_names` may incorrectly treat certificates containing an embedded null byte","details":"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.","published":"2025-12-03T18:31:50.389Z","modified":"2026-08-08T03:48:16.017060715Z","cvss":{"score":5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:L/A:N"},"epss":{"score":0.0017,"percentile":0.06676,"asOf":"2026-08-02"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/envoyproxy/envoy","fixedVersion":"1.36.3"},{"ecosystem":"Go","name":"github.com/envoyproxy/envoy","fixedVersion":"1.35.7"},{"ecosystem":"Go","name":"github.com/envoyproxy/envoy","fixedVersion":"1.34.11"},{"ecosystem":"Go","name":"github.com/envoyproxy/envoy","fixedVersion":"1.33.13"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66220.json"},{"type":"ADVISORY","url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-rwjg-c3h2-f57p"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66220"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-08T03:48:16.017060715Z"}}