{"id":"CVE-2021-31962","aliases":["EUVD-2021-18834","GHSA-775h-j8rj-hfwp"],"status":"published","title":"Kerberos AppContainer Security Feature Bypass Vulnerability","description":"Kerberos AppContainer Security Feature Bypass Vulnerability","severity":{"version":"3.1","score":9.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.03808,"percentile":0.90119,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-06-08T22:46:29Z","modified":"2026-06-17T03:52:34Z","products":[{"vendor":"microsoft","product":"windows 10 version 1507"},{"vendor":"microsoft","product":"windows 10 version 1607"},{"vendor":"microsoft","product":"windows 10 version 1809"},{"vendor":"microsoft","product":"windows 10 version 1909"},{"vendor":"microsoft","product":"windows 10 version 2004"},{"vendor":"microsoft","product":"windows 10 version 20h2"},{"vendor":"microsoft","product":"windows 10 version 21h1"},{"vendor":"microsoft","product":"windows 7"},{"vendor":"microsoft","product":"windows 7 service pack 1"},{"vendor":"microsoft","product":"windows 8.1"},{"vendor":"microsoft","product":"windows server 2008  service pack 2"},{"vendor":"microsoft","product":"windows server 2008 r2 service pack 1"},{"vendor":"microsoft","product":"windows server 2008 r2 service pack 1 (server core installation)"},{"vendor":"microsoft","product":"windows server 2008 service pack 2"},{"vendor":"microsoft","product":"windows server 2008 service pack 2 (server core installation)"},{"vendor":"microsoft","product":"windows server 2012"},{"vendor":"microsoft","product":"windows server 2012 (server core installation)"},{"vendor":"microsoft","product":"windows server 2012 r2"},{"vendor":"microsoft","product":"windows server 2012 r2 (server core installation)"},{"vendor":"microsoft","product":"windows server 2016"},{"vendor":"microsoft","product":"windows server 2016 (server core installation)"},{"vendor":"microsoft","product":"windows server 2019"},{"vendor":"microsoft","product":"windows server 2019 (server core installation)"},{"vendor":"microsoft","product":"windows server version 2004"},{"vendor":"microsoft","product":"windows server version 20h2"},{"vendor":"microsoft","product":"windows_10"},{"vendor":"microsoft","product":"windows_7"},{"vendor":"microsoft","product":"windows_8.1"},{"vendor":"microsoft","product":"windows_rt_8.1"},{"vendor":"microsoft","product":"windows_server_2008"},{"vendor":"microsoft","product":"windows_server_2012"},{"vendor":"microsoft","product":"windows_server_2016"},{"vendor":"microsoft","product":"windows_server_2019"}],"references":[{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31962","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"http://packetstormsecurity.com/files/163206/Windows-Kerberos-AppContainer-Enterprise-Authentication-Capability-Bypass.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","VDB Entry"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-31962"},{"url":"https://github.com/advisories/GHSA-775h-j8rj-hfwp"}],"sources":{"cve":[{"id":"CVE-2021-31962","title":"Kerberos AppContainer Security Feature Bypass Vulnerability","description":"Kerberos AppContainer Security Feature Bypass Vulnerability","status":"published","published":"2021-06-08T22:46:29Z","modified":"2024-08-03T23:10:31.301Z","cvss":[{"version":"3.1","score":9.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C","level":"critical","assessor":"cna"}],"updated_at":"2026-11-02T14:33:05.665371Z"}],"euvd":[{"id":"EUVD-2021-18834","description":"Kerberos AppContainer Security Feature Bypass Vulnerability","status":"published","published":"2021-06-08T22:46:29Z","modified":"2024-08-03T23:10:31Z","cvss":[{"version":"3.1","score":9.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C","level":"critical"}],"updated_at":"2026-11-03T03:24:37.407491Z"}],"ghsa":[{"id":"GHSA-775h-j8rj-hfwp","title":"Kerberos AppContainer Security Feature Bypass Vulnerability","description":"Kerberos AppContainer Security Feature Bypass Vulnerability","status":"published","published":"2022-05-24T19:04:47Z","modified":"2023-01-29T05:06:30Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T14:46:02.46151Z"}],"nvd":[{"id":"CVE-2021-31962","description":"Kerberos AppContainer Security Feature Bypass Vulnerability","status":"published","published":"2021-06-08T23:15:08.977Z","modified":"2026-06-17T03:52:34.97Z","cvss":[{"version":"3.1","score":9.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"critical","assessor":"secondary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"updated_at":"2026-11-02T14:06:54.439974Z"}]}}