{"id":"CVE-2021-43203","aliases":["EUVD-2021-30147","GHSA-p34x-8gxh-mj58"],"status":"published","title":"In JetBrains Ktor before 1.6.4, nonce verification during the OAuth2 authentication process is...","description":"In JetBrains Ktor before 1.6.4, nonce verification during the OAuth2 authentication process is implemented improperly.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00864,"percentile":0.59047,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-287"],"published":"2021-11-09T14:52:23Z","modified":"2026-10-24T10:30:36Z","products":[{"vendor":"jetbrains","product":"ktor"}],"references":[{"url":"https://blog.jetbrains.com/blog/2021/11/08/jetbrains-security-bulletin-q3-2021/","tags":["x_refsource_MISC","x_transferred","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43203"},{"url":"https://github.com/advisories/GHSA-p34x-8gxh-mj58"}],"sources":{"cve":[{"id":"CVE-2021-43203","description":"In JetBrains Ktor before 1.6.4, nonce verification during the OAuth2 authentication process is implemented improperly.","status":"published","published":"2021-11-09T14:52:23Z","modified":"2024-08-04T03:47:13.593Z","updated_at":"2026-11-02T14:32:57.033395Z"}],"euvd":[{"id":"EUVD-2021-30147","description":"In JetBrains Ktor before 1.6.4, nonce verification during the OAuth2 authentication process is implemented improperly.","status":"published","published":"2021-11-09T14:52:23Z","modified":"2024-08-04T03:47:13Z","updated_at":"2026-11-03T03:24:14.796505Z"}],"ghsa":[{"id":"GHSA-p34x-8gxh-mj58","title":"In JetBrains Ktor before 1.6.4, nonce verification during the OAuth2 authentication process is...","description":"In JetBrains Ktor before 1.6.4, nonce verification during the OAuth2 authentication process is implemented improperly.","status":"published","published":"2022-05-24T19:20:06Z","modified":"2023-01-30T05:03:49Z","cwes":["CWE-287"],"updated_at":"2026-11-02T14:46:54.738868Z"}],"nvd":[{"id":"CVE-2021-43203","description":"In JetBrains Ktor before 1.6.4, nonce verification during the OAuth2 authentication process is implemented improperly.","status":"published","published":"2021-11-09T15:15:10.11Z","modified":"2026-06-17T04:10:38.21Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:07:00.984108Z"}],"osv":[{"id":"CVE-2021-43203","description":"In JetBrains Ktor before 1.6.4, nonce verification during the OAuth2 authentication process is implemented improperly.","status":"published","published":"2021-11-09T15:15:10.11Z","modified":"2026-10-24T10:30:36.232748065Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:44:21.877444Z"}]}}