Medium
Envoy’s TLS certificate matcher for `match_typed_subject_alt_names` may incorrectly treat certificates containing an embedded null byte
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-66220
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 6 Nov 2026, 19:03 UTC · Revision 1
Source evidence
Envoy’s TLS certificate matcher for `match_typed_subject_alt_names` may incorrectly treat certificates containing an embedded null byte
core-osv · Original sourcePublished 3 Dec 2025, 18:31 UTC
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.
osv:CVE-2025-66220
Complete source record
{
"id": "287546aab90b95774011bf69e2060a36912438d6b9f734604799e14318b1220a",
"url": "https://osv.dev/vulnerability/CVE-2025-66220",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Envoy’s TLS certificate matcher for `match_typed_subject_alt_names` may incorrectly treat certificates containing an embedded null byte",
"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 byte (\\0) inside an OTHERNAME SAN value as valid matches.",
"evidence": "osv:CVE-2025-66220",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2025-66220",
"aliases": [
"BIT-envoy-2025-66220",
"CVE-2025-66220",
"GHSA-rwjg-c3h2-f57p"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/envoyproxy/envoy",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "b2670bbebda00060fc96f3cf9f0d6d2945e26ccf"
},
{
"introduced": "d7809ba2b07fd869d49bfb122b27f6a7977b4d94"
},
{
"fixed": "35e736f3dba538646bff402975604cfd3fe4a700"
},
{
"introduced": "84305a6cb64bd55aaf606bdd53de7cd6080427a1"
},
{
"fixed": "607aaa985080750ae29ac9f6e49a31a5445d28f4"
},
{
"introduced": "63ee0dc79dce88117c6bd2df5a742f8eb67ea980"
},
{
"fixed": "ddabe691e1aaa74b848d0782dab9dbea3b280319"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "1.33.13"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "1.34.0"
},
{
"fixed": "1.34.11"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "1.35.0"
},
{
"fixed": "1.35.7"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "1.36.0"
},
{
"fixed": "1.36.3"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v1.34.10",
"v1.35.6",
"v1.36.2",
"v1.33.12",
"v1.36.1",
"v1.35.5",
"v1.33.11",
"v1.34.9",
"v1.36.0",
"v1.35.4",
"v1.34.8",
"v1.33.10",
"v1.33.9",
"v1.35.3",
"v1.34.7",
"v1.35.2",
"v1.33.8",
"v1.34.6",
"v1.34.5",
"v1.35.1",
"v1.33.7",
"v1.34.4",
"v1.33.6",
"v1.35.0",
"v1.34.3",
"v1.33.5",
"v1.34.2",
"v1.33.4",
"v1.33.3",
"v1.34.1",
"v1.34.0",
"v1.33.2",
"v1.33.1",
"v1.33.0",
"v1.32.0",
"v1.31.0",
"v1.30.0",
"v1.29.0",
"v1.28.0",
"v1.27.0",
"v1.26.0",
"v1.25.0",
"v1.24.0",
"v1.23.0",
"v1.22.0",
"v1.21.0",
"v1.20.0",
"v1.19.0",
"v1.18.2",
"v1.18.1",
"v1.18.0",
"v1.17.0",
"v1.16.0",
"v1.15.0",
"v1.14.0",
"v1.13.0",
"v1.12.0",
"v1.11.0",
"v1.10.0",
"v1.9.0",
"v1.8.0",
"v1.7.0",
"v1.6.0",
"v1.5.0",
"v1.4.0",
"v1.3.0",
"v1.2.0",
"v1.1.0",
"v1.0.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-66220.json"
}
}
],
"modified": "2026-10-28T02:30:47.917565090Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66220.json",
"https://github.com/envoyproxy/envoy/security/advisories/GHSA-rwjg-c3h2-f57p",
"https://nvd.nist.gov/vuln/detail/CVE-2025-66220"
],
"provider_metadata": {
"cwe_ids": [
"CWE-170"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66220.json"
}
},
"related_cves": [
{
"value": "CVE-2025-66220",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 515937,
"published_at": "2025-12-03T18:31:50.389+00:00"
}