How severe is CVE-2022-21656?

This vulnerability has a severity rating of MEDIUM with a CVSS score of 5.9 out of 10.

What type of vulnerability is CVE-2022-21656?

This is classified as CWE-295, which is a common weakness in software security.

CVE-2022-21656 - MEDIUM Severity | CVSS 5.9

Vulnerability 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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