Description
Envoy is an open source edge and service proxy, designed for cloud-native applications. The default_validator.cc implementation used to implement the default certificate validation routines has a "type confusion" bug when processing subjectAltNames. This processing allows, for example, an rfc822Name or uniformResourceIndicator to be authenticated as a domain name. This confusion allows for the bypassing of nameConstraints, as processed by the underlying OpenSSL/BoringSSL implementation, exposing the possibility of impersonation of arbitrary servers. As a result Envoy will trust upstream certificates that should not be trusted.
References (2)
Core 2
Core References
Issue Tracking, Third Party Advisory x_refsource_confirm
https://github.com/envoyproxy/envoy/security/advisories/GHSA-c9g7-xwcv-pjx2
Patch, Third Party Advisory x_refsource_misc
https://github.com/envoyproxy/envoy/commit/bb95af848c939cfe5b5ee33c5b1770558077e64e
Scores
CVSS v3
7.4
EPSS
0.0002
EPSS Percentile
3.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-295
CWE-843
Status
published
Products (1)
envoyproxy/envoy
< 1.20.2
Published
Feb 22, 2022
Tracked Since
Feb 18, 2026