CVE-2022-21656 (GCVE-0-2022-21656)

Vulnerability from cvelistv5 – Published: 2022-02-22 22:25 – Updated: 2025-04-23 19:01
VLAI
Title
X.509 subjectAltName matching bypass in Envoy
Summary
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.
Severity
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-23 15:55 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7668 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
envoyproxy envoy Affected: < 1.20.2
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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                  "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-c9g7-xwcv-pjx2"
                },
                {
                  "name": "https://github.com/envoyproxy/envoy/commit/bb95af848c939cfe5b5ee33c5b1770558077e64e",
                  "refsource": "MISC",
                  "url": "https://github.com/envoyproxy/envoy/commit/bb95af848c939cfe5b5ee33c5b1770558077e64e"
                }
              ]
            },
            "source": {
              "advisory": "GHSA-c9g7-xwcv-pjx2",
              "discovery": "UNKNOWN"
            }
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2022-21656",
        "datePublished": "2022-02-22T22:25:11.000Z",
        "dateReserved": "2021-11-16T00:00:00.000Z",
        "dateUpdated": "2025-04-23T19:01:38.563Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Sightings

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