{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:jetbrains:ktor:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.6.4"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "832b70cff2522f1c6844c32fe8509a10e5a2ce4b"
            }
          ],
          "repo": "https://github.com/ktorio/ktor",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {},
  "details": "In JetBrains Ktor before 1.6.4, nonce verification during the OAuth2 authentication process is implemented improperly.",
  "id": "CVE-2021-43203",
  "modified": "2026-07-08T05:38:13.397262604Z",
  "published": "2021-11-09T15:15:10.110Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://blog.jetbrains.com/blog/2021/11/08/jetbrains-security-bulletin-q3-2021/"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}