7.4
High
CVE-2022-21656 Envoy is an open source edge and service proxy, designed for cloud-native applications
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| envoy 1.20 | earliest → < 1.20.2 | 1.20.2 |
Other CVEs of envoy
The 98 CVEs of envoy →
CVE-2026-73511
Envoy is an open source edge and service proxy designed for cloud-native applications
5.3
Medium
CVE-2026-73553
Envoy is an open source edge and service proxy designed for cloud-native applications
7.5
High
CVE-2026-73551
Envoy is an open source edge and service proxy designed for cloud-native applications
5.3
Medium
CVE-2026-73546
Envoy is an open source edge and service proxy designed for cloud-native applications
7.4
High