{"id":"CVE-2020-0909","title":"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 S…","summary":"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 S…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","vendor":"microsoft","product":"windows_10","affected":["windows_10","windows_10 = 1607","windows_10 = 1709","windows_10 = 1803","windows_10 = 1809","windows_10 = 1903","windows_10 = 1909","windows_7","windows_8.1","windows_server_2008","windows_server_2008 = r2","windows_server_2012","windows_server_2012 = r2","windows_server_2016","windows_server_2016 = 1803","windows_server_2016 = 1903","windows_server_2016 = 1909","windows_server_2019"],"published":"2020-05-21","updated":"2026-08-19","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2020-0909","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-0909","label":"secure@microsoft.com"},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0909","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.04577,"epssPercentile":0.91207,"ingestedAt":"2026-08-19T17:42:35.989Z","slug":"CVE-2020-0909","body":"## Overview\n\nA 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.\n\n## Affected\n\n- `windows_10`\n- `windows_10 = 1607`\n- `windows_10 = 1709`\n- `windows_10 = 1803`\n- `windows_10 = 1809`\n- `windows_10 = 1903`\n- `windows_10 = 1909`\n- `windows_7`\n- `windows_8.1`\n- `windows_server_2008`\n- `windows_server_2008 = r2`\n- `windows_server_2012`\n- `windows_server_2012 = r2`\n- `windows_server_2016`\n- `windows_server_2016 = 1803`\n- `windows_server_2016 = 1903`\n- `windows_server_2016 = 1909`\n- `windows_server_2019`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":41.3,"likelihood":0.9,"exploitation":0,"ransomware":0},"changes":[]}