{"cve":"CVE-2019-20894","nvd":{"published":"2020-07-02T16:15:11.357","modified":"2026-06-17T02:31:23.820","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":["CWE-295"],"references":["https://github.com/containous/traefik/issues/5312","https://github.com/containous/traefik/issues/5312"],"products":["traefik:traefik"],"source":"nvd","synced_at":"2026-10-19T21:06:22.076270124+00:00"},"epss":{"cve":"CVE-2019-20894","score":0.01557,"percentile":0.75195,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-q9mp-79cp-9g8j","url":"https://osv.dev/vulnerability/GHSA-q9mp-79cp-9g8j","summary":"Improper Authentication","modified":"2024-08-21T15:58:29.337549Z","packages":[{"ecosystem":"Go","name":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","ranges":["<2.2.2"],"fixed":["2.2.2"]}]},{"id":"GO-2022-0774","url":"https://osv.dev/vulnerability/GO-2022-0774","summary":"Improper Authentication in github.com/containous/traefik","modified":"2026-03-03T04:50:51.279496Z","packages":[{"ecosystem":"Go","name":"github.com/containous/traefik","purl":"pkg:golang/github.com/containous/traefik","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/containous/traefik/v2","purl":"pkg:golang/github.com/containous/traefik/v2","ranges":["<2.2.2"],"fixed":["2.2.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}