{"id":"CVE-2021-26867","aliases":["EUVD-2021-13651","GHSA-9wfr-5hw8-6f68"],"status":"published","title":"Windows Hyper-V Remote Code Execution Vulnerability","description":"Windows Hyper-V Remote Code Execution Vulnerability","severity":{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.02866,"percentile":0.86952,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-03-11T15:38:38Z","modified":"2026-08-19T18:32:31Z","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-2021-26867","tags":["vendor-advisory","patch"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26867","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26867"},{"url":"https://github.com/advisories/GHSA-9wfr-5hw8-6f68"}],"sources":{"cve":[{"id":"CVE-2021-26867","title":"Windows Hyper-V Remote Code Execution Vulnerability","description":"Windows Hyper-V Remote Code Execution Vulnerability","status":"published","published":"2021-03-11T15:38:38Z","modified":"2026-08-19T16:30:21.313Z","cvss":[{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"critical","assessor":"cna"}],"updated_at":"2026-11-02T14:32:57.368269Z"}],"euvd":[{"id":"EUVD-2021-13651","description":"Windows Hyper-V Remote Code Execution Vulnerability","status":"published","published":"2021-03-11T15:38:38Z","modified":"2026-08-19T16:30:21Z","cvss":[{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"critical"}],"updated_at":"2026-11-02T18:01:42.811156Z"}],"ghsa":[{"id":"GHSA-9wfr-5hw8-6f68","title":"Windows Hyper-V Remote Code Execution Vulnerability","description":"Windows Hyper-V Remote Code Execution Vulnerability","status":"published","published":"2022-05-24T17:44:19Z","modified":"2026-08-19T18:32:31Z","cvss":[{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:10:42.300371Z"}],"nvd":[{"id":"CVE-2021-26867","description":"Windows Hyper-V Remote Code Execution Vulnerability","status":"published","published":"2021-03-11T16:15:14.503Z","modified":"2026-08-19T17:17:40.59Z","cvss":[{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"secondary"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":7.2,"vector":"AV:L/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"updated_at":"2026-11-02T14:06:50.805771Z"}]}}