{"id":"CVE-2021-1691","aliases":["EUVD-2021-7158","GHSA-rr79-vpcm-v7rm"],"status":"published","title":"Windows Hyper-V Denial of Service Vulnerability","description":"Windows Hyper-V Denial of Service Vulnerability","severity":{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.04069,"percentile":0.90763,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-01-12T19:42:29Z","modified":"2026-06-17T03:32:20Z","products":[{"vendor":"microsoft","product":"windows 10 version 1909"},{"vendor":"microsoft","product":"windows 10 version 2004"},{"vendor":"microsoft","product":"windows server version 2004"},{"vendor":"microsoft","product":"windows server version 20h2"},{"vendor":"microsoft","product":"windows server, version 1909 (server core installation)"},{"vendor":"microsoft","product":"windows_10"},{"vendor":"microsoft","product":"windows_server_2016"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1691","tags":["vendor-advisory"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1691","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-1691"},{"url":"https://github.com/advisories/GHSA-rr79-vpcm-v7rm"}],"sources":{"cve":[{"id":"CVE-2021-1691","title":"Windows Hyper-V Denial of Service Vulnerability","description":"Windows Hyper-V Denial of Service Vulnerability","status":"published","published":"2021-01-12T19:42:29Z","modified":"2024-11-19T15:20:24.247Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"updated_at":"2026-11-02T14:33:08.409321Z"}],"euvd":[{"id":"EUVD-2021-7158","description":"Windows Hyper-V Denial of Service Vulnerability","status":"published","published":"2021-01-12T19:42:29Z","modified":"2024-11-19T15:20:24Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-03T00:04:56.132572Z"}],"ghsa":[{"id":"GHSA-rr79-vpcm-v7rm","title":"Hyper-V Denial of Service Vulnerability This CVE ID is unique from CVE-2021-1692.","description":"Hyper-V Denial of Service Vulnerability This CVE ID is unique from CVE-2021-1692.","status":"published","published":"2022-05-24T17:38:48Z","modified":"2024-10-08T18:34:08Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T14:58:27.293589Z"}],"nvd":[{"id":"CVE-2021-1691","description":"Windows Hyper-V Denial of Service Vulnerability","status":"published","published":"2021-01-12T20:15:33.353Z","modified":"2026-06-17T03:32:20.863Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:49.284888Z"}]}}