{"schemaVersion":3,"id":"CVE-2022-21657","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"Envoy is an open source edge and service proxy, designed for cloud-native applications. In affected versions Envoy does not restrict the set of certificates it accepts from the peer, either as a TLS client or a TLS server, to only those certificates that contain the necessary extendedKeyUsage (id-kp-serverAuth and id-kp-clientAuth, respectively). This means that a peer may present an e-mail certificate (e.g. id-kp-emailProtection), either as a leaf certificate or as a CA in the chain, and it will be accepted for TLS. This is particularly bad when combined with the issue described in pull request #630, in that it allows a Web PKI CA that is intended only for use with S/MIME, and thus exempted from audit or supervision, to issue TLS certificates that will be accepted by Envoy. As a result Envoy will trust upstream certificates that should not be trusted. There are no known workarounds to this issue. Users are advised to upgrade.","dates":{"published":"2022-02-22T22:30:12.000Z","modified":"2025-04-23T19:01:32.824Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6.8,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":6.8,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":6.5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":4,"severity":"medium","vector":"AV:N/AC:L/Au:S/C:N/I:P/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00517,"percentile":0.42845,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00517},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00517,"percentile":0.42845}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00517,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00517,"percentile":null},{"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