{"id":"CVE-2021-31205","aliases":["EUVD-2021-18118","GHSA-7h4c-m77c-qp3c"],"status":"published","title":"Windows SMB Client Security Feature Bypass Vulnerability","description":"Windows SMB Client Security Feature Bypass Vulnerability","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.02911,"percentile":0.87167,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-05-11T19:11:40Z","modified":"2026-06-17T03:51:26Z","products":[{"vendor":"microsoft","product":"windows 10 version 2004"},{"vendor":"microsoft","product":"windows 10 version 20h2"},{"vendor":"microsoft","product":"windows server version 2004"},{"vendor":"microsoft","product":"windows server version 20h2"},{"vendor":"microsoft","product":"windows_10"},{"vendor":"microsoft","product":"windows_server_2016"}],"references":[{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31205","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-31205"},{"url":"https://github.com/advisories/GHSA-7h4c-m77c-qp3c"}],"sources":{"cve":[{"id":"CVE-2021-31205","title":"Windows SMB Client Security Feature Bypass Vulnerability","description":"Windows SMB Client Security Feature Bypass Vulnerability","status":"published","published":"2021-05-11T19:11:40Z","modified":"2024-08-03T22:55:53.518Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:33:05.331617Z"}],"euvd":[{"id":"EUVD-2021-18118","description":"Windows SMB Client Security Feature Bypass Vulnerability","status":"published","published":"2021-05-11T19:11:40Z","modified":"2024-08-03T22:55:53Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-03T03:24:39.559154Z"}],"ghsa":[{"id":"GHSA-7h4c-m77c-qp3c","title":"Windows SMB Client Security Feature Bypass Vulnerability","description":"Windows SMB Client Security Feature Bypass Vulnerability","status":"published","published":"2022-05-24T19:01:59Z","modified":"2023-08-10T05:04:46Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T14:54:44.654498Z"}],"nvd":[{"id":"CVE-2021-31205","description":"Windows SMB Client Security Feature Bypass Vulnerability","status":"published","published":"2021-05-11T19:15:10.363Z","modified":"2026-06-17T03:51:26.897Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:53.343329Z"}]}}