{"id":"CVE-2020-0909","url":"https://www.cyber-defence.io/tools/cve/CVE-2020-0909","generatedAt":"2026-10-27T23:28:44.577Z","title":"A denial of service vulnerability exists when Hyper-V on a Windows Server fails to properly handle specially crafted network packets.","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.","published":"2020-05-21T23:15:11.000Z","lastModified":"2026-08-19T17:17:07.000Z","status":"Modified","sourceIdentifier":"secure@microsoft.com","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":[],"affected":["microsoft/windows 10","microsoft/windows 7","microsoft/windows 8.1","microsoft/windows server 2008","microsoft/windows server 2012","microsoft/windows server 2016","microsoft/windows server 2019"],"epss":{"score":0.0473,"percentile":0.91785,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (4.73%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-0909","source":"secure@microsoft.com"},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0909","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-0909","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}