High severity7.4NVD Advisory· Published Feb 22, 2022· Updated Jun 17, 2026
CVE-2022-21656
CVE-2022-21656
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.
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Affected products
4< 1.20.2+ 2 more
- (no CPE)range: < 1.20.2
- (no CPE)
- cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*range: <1.20.2
Patches
Vulnerability mechanics
References
2- github.com/envoyproxy/envoy/commit/bb95af848c939cfe5b5ee33c5b1770558077e64envdPatchThird Party Advisory
- github.com/envoyproxy/envoy/security/advisories/GHSA-c9g7-xwcv-pjx2nvdIssue TrackingThird Party Advisory
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