{"id":"CVE-2021-40461","aliases":["EUVD-2021-27638","GHSA-v4jp-hh77-wpg7"],"status":"published","title":"Windows Hyper-V Remote Code Execution Vulnerability","description":"Windows Hyper-V Remote Code Execution Vulnerability","severity":{"version":"3.1","score":8,"vector":"CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.01362,"percentile":0.7197,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-10-13T00:26:58Z","modified":"2026-06-17T04:06:57Z","products":[{"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 21h1"},{"vendor":"microsoft","product":"windows 11 version 21h2"},{"vendor":"microsoft","product":"windows server 2019"},{"vendor":"microsoft","product":"windows server 2019 (server core installation)"},{"vendor":"microsoft","product":"windows server 2022"},{"vendor":"microsoft","product":"windows server version 2004"},{"vendor":"microsoft","product":"windows server version 20h2"},{"vendor":"microsoft","product":"windows_10"},{"vendor":"microsoft","product":"windows_11"},{"vendor":"microsoft","product":"windows_server"},{"vendor":"microsoft","product":"windows_server_2016"},{"vendor":"microsoft","product":"windows_server_2019"},{"vendor":"microsoft","product":"windows_server_2022"}],"references":[{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40461","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-40461"},{"url":"https://github.com/advisories/GHSA-v4jp-hh77-wpg7"}],"sources":{"cve":[{"id":"CVE-2021-40461","title":"Windows Hyper-V Remote Code Execution Vulnerability","description":"Windows Hyper-V Remote Code Execution Vulnerability","status":"published","published":"2021-10-13T00:26:58Z","modified":"2024-08-04T02:44:10.409Z","cvss":[{"version":"3.1","score":8,"vector":"CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"updated_at":"2026-11-02T14:33:01.495293Z"}],"euvd":[{"id":"EUVD-2021-27638","description":"Windows Hyper-V Remote Code Execution Vulnerability","status":"published","published":"2021-10-13T00:26:58Z","modified":"2024-08-04T02:44:10Z","cvss":[{"version":"3.1","score":8,"vector":"CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-03T03:24:20.862157Z"}],"ghsa":[{"id":"GHSA-v4jp-hh77-wpg7","title":"Windows Hyper-V Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-38672.","description":"Windows Hyper-V Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-38672.","status":"published","published":"2022-05-24T19:17:33Z","modified":"2023-01-30T05:02:39Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T14:46:41.667597Z"}],"nvd":[{"id":"CVE-2021-40461","description":"Windows Hyper-V Remote Code Execution Vulnerability","status":"published","published":"2021-10-13T01:15:10.093Z","modified":"2026-06-17T04:06:57.81Z","cvss":[{"version":"3.1","score":8,"vector":"CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"secondary"},{"version":"2.0","score":5.2,"vector":"AV:A/AC:L/Au:S/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:59.689345Z"}]}}