Search/CVE-2025-66220
● CVE — Medium

CVE-2025-66220

VendorenvoyproxyProductenvoyDiscoveredDec 3, 2025UpdatedSep 25, 2026

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.

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CVSS v3.1
5 MEDIUM
EPSS
0.18%
probability of exploitation in 30 days
CISA KEV
Not listed
no confirmed exploitation reported
News coverage
0
sources referencing this CVE
Related IOCs
0
seen in the same coverage
EPSS Trend
Aug 16, 2026 → Nov 4, 2026
▲ 0.01pp
0.17% → 0.18% over 3 tracked changes
CVSS v3.1 Detail
Attack VectorNETWORK
Attack ComplexityHIGH
Privileges RequiredHIGH
User InteractionNONE
ScopeUNCHANGED
ConfidentialityHIGH
IntegrityLOW
AvailabilityNONE
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:L/A:N
Connections
2 relationships
Timeline
disclosure → media coverage
Dec 3, 2025
Disclosure — published as a CVE record. · last revised by NVD Sep 25, 2026