{"id":"CVE-2019-20894","aliases":["GHSA-q9mp-79cp-9g8j","GO-2022-0774"],"url":"https://o3.security/vulnerability/CVE-2019-20894","summary":"Improper Authentication","details":"Traefik 2.x, in certain configurations, allows HTTPS sessions to proceed without mutual TLS verification in a situation where ERR_BAD_SSL_CLIENT_AUTH_CERT should have occurred.","published":"2020-07-02T16:15:11.357Z","modified":"2026-08-07T15:19:04.704816Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"Go","name":"github.com/traefik/traefik/v2","fixedVersion":"2.2.2"}],"fix":{"url":"https://github.com/containous/traefik/pull/7008","label":"containous/traefik#7008"},"references":[{"type":"REPORT","url":"https://github.com/containous/traefik/issues/5312"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2019-20894"},{"type":"WEB","url":"https://github.com/containous/traefik/pull/7008"},{"type":"WEB","url":"https://github.com/containous/traefik/commit/2b353971696717e980521b0e4baa1eba66c8d2bf"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T15:19:04.704816Z"}}