{"id":"CVE-2018-8439","url":"https://www.cyber-defence.io/tools/cve/CVE-2018-8439","generatedAt":"2026-10-28T20:07:46.668Z","title":"A remote code execution vulnerability exists when Windows Hyper-V on a host server fails to properly validate input from an authenticated user on a guest operating system, aka \"Windows Hyper-V Remote Code Execution Vulnerability.\" This affects Windows…","description":"A remote code execution vulnerability exists when Windows Hyper-V on a host server fails to properly validate input from an authenticated user on a guest operating system, aka \"Windows Hyper-V Remote Code Execution Vulnerability.\" This affects Windows Server 2012 R2, Windows RT 8.1, Windows Server 2016, Windows 8.1, Windows 10, Windows 10 Servers. This CVE ID is unique from CVE-2018-0965.","published":"2018-09-13T00:29:04.000Z","lastModified":"2026-06-17T02:04:53.000Z","status":"Modified","sourceIdentifier":"secure@microsoft.com","cvss":{"version":"3.0","score":8.4,"severity":"HIGH","vector":"CVSS:3.0/AV:A/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H"},"cwe":["CWE-20"],"affected":["microsoft/windows 10","microsoft/windows 8.1","microsoft/windows rt 8.1","microsoft/windows server 2012","microsoft/windows server 2016"],"epss":{"score":0.04309,"percentile":0.91104,"date":"2026-10-27","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 (4.31%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"http://www.securityfocus.com/bid/105233","tags":["Third Party Advisory","VDB Entry"],"source":"secure@microsoft.com"},{"url":"http://www.securitytracker.com/id/1041624","tags":["Third Party Advisory","VDB Entry"],"source":"secure@microsoft.com"},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8439","tags":["Patch","Vendor Advisory"],"source":"secure@microsoft.com"},{"url":"http://www.securityfocus.com/bid/105233","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1041624","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8439","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2018-8439","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."}