{"id":"CVE-2025-66220","title":"Envoy is a high-performance edge/middle/service proxy","summary":"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 by…","severity":"medium","cvss":5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:L/A:N","cwe":["CWE-170"],"vendor":"envoyproxy","product":"envoy","affected":["envoy < 1.33.13","envoy >= 1.34.0, < 1.34.11","envoy >= 1.35.0, < 1.35.7","envoy >= 1.36.0, < 1.36.3"],"patched":["envoy 1.36.3"],"published":"2025-12-03","updated":"2026-09-25","sourceUpdated":"2026-09-25T23:10:00.463","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-66220","references":[{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-rwjg-c3h2-f57p","label":"security-advisories@github.com"}],"tags":["nvd"],"epss":0.00168,"epssPercentile":0.05367,"ingestedAt":"2026-09-25T23:21:16.870Z","slug":"CVE-2025-66220","body":"## Overview\n\nEnvoy 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.\n\n## Affected\n\n- `envoy < 1.33.13`\n- `envoy >= 1.34.0, < 1.34.11`\n- `envoy >= 1.35.0, < 1.35.7`\n- `envoy >= 1.36.0, < 1.36.3`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `envoy 1.36.3`","depth":"sunlit","depthScore":28,"depthScoreParts":{"impact":27.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}