Security advisory

{
  "id": "1bb04c5d70772fbd07006a88494bf0a19c7481b7457a408accafa9bf6ef3aebd",
  "url": "https://osv.dev/vulnerability/CVE-2019-20894",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2019-20894",
    "summary": "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.",
    "evidence": "osv:CVE-2019-20894",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2019-20894",
      "aliases": [
        "CVE-2019-20894",
        "GHSA-q9mp-79cp-9g8j",
        "GO-2022-0774"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/traefik/traefik",
              "type": "GIT",
              "events": [
                {
                  "introduced": "3d784a14f9a5b6f7631af87498a7c1f35664a5b1"
                },
                {
                  "fixed": "8d7af21ff3112601d50d7395ad413ee9f1e3f32a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.0.0"
                      },
                      {
                        "fixed": "2.0.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-20894.json"
          }
        }
      ],
      "modified": "2026-10-20T10:52:40.658202049Z",
      "provider": "osv",
      "references": [
        "https://github.com/containous/traefik/issues/5312"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2019-20894",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 383729,
  "published_at": "2020-07-02T16:15:11.357+00:00"
}