CVE-2025-66220
Dec. 4, 2025, 5:15 p.m.
5.0
Medium
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.
Product(s) Impacted
| Vendor | Product | Versions |
|---|---|---|
| Envoy |
|
|
Weaknesses
Common security weaknesses mapped to this vulnerability.
CWE-170
Improper Null Termination
The product does not terminate or incorrectly terminates a string or array with a null character or equivalent terminator.
*CPE(s)
Affected systems and software identified for this CVE.
| Type | Vendor | Product | Version | Update | Edition | Language | Software Edition | Target Software | Target Hardware | Other Information |
|---|---|---|---|---|---|---|---|---|---|---|
| a | envoy | envoy | 1.33.12 | / | / | / | / | / | / | / |
| a | envoy | envoy | 1.34.10 | / | / | / | / | / | / | / |
| a | envoy | envoy | 1.35.6 | / | / | / | / | / | / | / |
| a | envoy | envoy | 1.36.2 | / | / | / | / | / | / | / |
Tags
CVSS Score
CVSS Data - 3.1
- Attack Vector: NETWORK
- Attack Complexity: HIGH
- Privileges Required: HIGH
- Scope: UNCHANGED
- Confidentiality Impact: HIGH
- Integrity Impact: LOW
- Availability Impact: NONE
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:L/A:N
Timeline
Published: Dec. 3, 2025, 7:15 p.m.
Last Modified: Dec. 4, 2025, 5:15 p.m.
Last Modified: Dec. 4, 2025, 5:15 p.m.
Status : Undergoing Analysis
CVE has been recently published to the CVE List and has been received by the NVD.
More infoSource
security-advisories@github.com
*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.