CVE-2025-66220
Last modified
CVE-2025-66220 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. 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.. EPSS estimates a 0.16% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Envoyproxy | Envoy | < 1.33.13 |
| Envoyproxy | Envoy | >= 1.34.0, < 1.34.11 |
| Envoyproxy | Envoy | >= 1.35.0, < 1.35.7 |
| Envoyproxy | Envoy | >= 1.36.0, < 1.36.3 |
References
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-rwjg-c3h2-f57pExploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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