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CVE-2022-21656

7.4 · HIGH

Envoy is an open source edge and service proxy, designed for cloud-native applications.

Published Feb 22, 2022CWE-295EPSS 0.67%

Overview

CVE-2022-21656 is a high-severity vulnerability. It was published on February 22, 2022 and has a CVSS 3.1 base score of 7.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/envoyproxy/envoy/commit/bb95af848c939cfe5b5ee33c5b1770558077e64eGitHubgithub.com/envoyproxy/envoy/security/advisories/GHSA-c9g7-xwcv-pjx2GitHubgithub.com/envoyproxy/envoy/commit/bb95af848c939cfe5b5ee33c5b1770558077e64eGitHubgithub.com/envoyproxy/envoy/security/advisories/GHSA-c9g7-xwcv-pjx2

How CyberStrike helps

Frequently asked questions

What is CVE-2022-21656?

CVE-2022-21656 is a high-severity vulnerability. It was published on February 22, 2022 and has a CVSS 3.1 base score of 7.4 (HIGH).

How severe is CVE-2022-21656?

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2022-21656?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-21656?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-21656 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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