{"id":"CVE-2020-0909","aliases":["EUVD-2020-2377","GHSA-29r6-grc2-5h75"],"status":"published","title":"Windows Hyper-V Denial of Service Vulnerability","description":"A denial of service vulnerability exists when Hyper-V on a Windows Server fails to properly handle specially crafted network packets.\nTo exploit the vulnerability, an attacker would send specially crafted network packets to the Hyper-V Server.\nThe security update addresses the vulnerability by resolving the conditions where Hyper-V would fail to properly handle these network packets.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.0473,"percentile":0.91923,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20"],"published":"2020-05-21T22:52:45Z","modified":"2026-08-19T18:32:15Z","products":[{"vendor":"microsoft","product":"windows 10 version 1507"},{"vendor":"microsoft","product":"windows 10 version 1607"},{"vendor":"microsoft","product":"windows 10 version 1709"},{"vendor":"microsoft","product":"windows 10 version 1803"},{"vendor":"microsoft","product":"windows 10 version 1809"},{"vendor":"microsoft","product":"windows 10 version 1903 for x64-based systems"},{"vendor":"microsoft","product":"windows 10 version 1909"},{"vendor":"microsoft","product":"windows 7 service pack 1"},{"vendor":"microsoft","product":"windows 8.1"},{"vendor":"microsoft","product":"windows server 2008 r2 service pack 1"},{"vendor":"microsoft","product":"windows server 2008 r2 service pack 1 (server core installation)"},{"vendor":"microsoft","product":"windows server 2008 service pack 2"},{"vendor":"microsoft","product":"windows server 2008 service pack 2 (server core installation)"},{"vendor":"microsoft","product":"windows server 2012"},{"vendor":"microsoft","product":"windows server 2012 (server core installation)"},{"vendor":"microsoft","product":"windows server 2012 r2"},{"vendor":"microsoft","product":"windows server 2012 r2 (server core installation)"},{"vendor":"microsoft","product":"windows server 2016"},{"vendor":"microsoft","product":"windows server 2016 (server core installation)"},{"vendor":"microsoft","product":"windows server 2019"},{"vendor":"microsoft","product":"windows server 2019 (server core installation)"},{"vendor":"microsoft","product":"windows server, version 1803  (server core installation)"},{"vendor":"microsoft","product":"windows server, version 1903 (server core installation)"},{"vendor":"microsoft","product":"windows server, version 1909 (server core installation)"},{"vendor":"microsoft","product":"windows_10"},{"vendor":"microsoft","product":"windows_7"},{"vendor":"microsoft","product":"windows_8.1"},{"vendor":"microsoft","product":"windows_server_2008"},{"vendor":"microsoft","product":"windows_server_2012"},{"vendor":"microsoft","product":"windows_server_2016"},{"vendor":"microsoft","product":"windows_server_2019"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-0909","tags":["vendor-advisory","patch"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0909","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-0909"},{"url":"https://github.com/advisories/GHSA-29r6-grc2-5h75"}],"sources":{"cve":[{"id":"CVE-2020-0909","title":"Windows Hyper-V Denial of Service Vulnerability","description":"A denial of service vulnerability exists when Hyper-V on a Windows Server fails to properly handle specially crafted network packets.\nTo exploit the vulnerability, an attacker would send specially crafted network packets to the Hyper-V Server.\nThe security update addresses the vulnerability by resolving the conditions where Hyper-V would fail to properly handle these network packets.","status":"published","published":"2020-05-21T22:52:45Z","modified":"2026-08-19T16:33:16.639Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C","level":"high","assessor":"cna"}],"updated_at":"2026-11-02T14:35:59.434367Z"}],"euvd":[{"id":"EUVD-2020-2377","description":"A denial of service vulnerability exists when Hyper-V on a Windows Server fails to properly handle specially crafted network packets.\nTo exploit the vulnerability, an attacker would send specially crafted network packets to the Hyper-V Server.\nThe security update addresses the vulnerability by resolving the conditions where Hyper-V would fail to properly handle these network packets.","status":"published","published":"2020-05-21T22:52:45Z","modified":"2026-08-19T16:33:16Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-02T18:01:42.411264Z"}],"ghsa":[{"id":"GHSA-29r6-grc2-5h75","title":"A denial of service vulnerability exists when Hyper-V on a Windows Server fails to properly...","description":"A denial of service vulnerability exists when Hyper-V on a Windows Server fails to properly handle specially crafted network packets.To exploit the vulnerability, an attacker would send specially crafted network packets to the Hyper-V Server.The security update addresses the vulnerability by resolving the conditions where Hyper-V would fail to properly handle these network packets., aka 'Windows Hyper-V Denial of Service Vulnerability'.","status":"published","published":"2022-05-24T17:18:22Z","modified":"2026-08-19T18:32:15Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T15:10:40.943268Z"}],"nvd":[{"id":"CVE-2020-0909","description":"A denial of service vulnerability exists when Hyper-V on a Windows Server fails to properly handle specially crafted network packets.\nTo exploit the vulnerability, an attacker would send specially crafted network packets to the Hyper-V Server.\nThe security update addresses the vulnerability by resolving the conditions where Hyper-V would fail to properly handle these network packets.","status":"published","published":"2020-05-21T23:15:11.273Z","modified":"2026-08-19T17:17:07.417Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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":"2026-11-02T14:06:04.922138Z"}]}}