{"id":"CVE-2021-33755","aliases":["EUVD-2021-20432","GHSA-m8cf-5cgm-249r"],"status":"published","title":"Windows Hyper-V Denial of Service Vulnerability","description":"Windows Hyper-V Denial of Service Vulnerability","severity":{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.03137,"percentile":0.87999,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-07-14T17:53:29Z","modified":"2026-08-10T18:30:33Z","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 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_server_2016"},{"vendor":"microsoft","product":"windows_server_2019"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33755","tags":["vendor-advisory","patch"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33755","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33755"},{"url":"https://github.com/advisories/GHSA-m8cf-5cgm-249r"}],"sources":{"cve":[{"id":"CVE-2021-33755","title":"Windows Hyper-V Denial of Service Vulnerability","description":"Windows Hyper-V Denial of Service Vulnerability","status":"published","published":"2021-07-14T17:53:29Z","modified":"2026-08-10T15:10:59.261Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:33:10.204494Z"}],"euvd":[{"id":"EUVD-2021-20432","description":"Windows Hyper-V Denial of Service Vulnerability","status":"published","published":"2021-07-14T17:53:29Z","modified":"2026-08-10T15:10:59Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-02T18:02:04.543433Z"}],"ghsa":[{"id":"GHSA-m8cf-5cgm-249r","title":"Windows Hyper-V Denial of Service Vulnerability This CVE ID is unique from CVE-2021-33758.","description":"Windows Hyper-V Denial of Service Vulnerability This CVE ID is unique from CVE-2021-33758.","status":"published","published":"2022-05-24T19:07:55Z","modified":"2026-08-10T18:30:33Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:10:14.126548Z"}],"nvd":[{"id":"CVE-2021-33755","description":"Windows Hyper-V Denial of Service Vulnerability","status":"published","published":"2021-07-14T18:15:10.037Z","modified":"2026-08-10T16:17:38.35Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H","level":"medium","assessor":"secondary"},{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:55.747384Z"}]}}