{"id":"CVE-2025-21333","url":"https://www.cyber-defence.io/tools/cve/CVE-2025-21333","generatedAt":"2026-10-31T08:10:20.987Z","title":"Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow Vulnerability","description":"Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability","published":"2025-01-14T18:15:59.000Z","lastModified":"2026-06-17T08:43:08.000Z","status":"Analyzed","sourceIdentifier":"secure@microsoft.com","cvss":{"version":"3.1","score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-122"],"affected":["microsoft/windows 10 21h2","microsoft/windows 10 22h2","microsoft/windows 11 22h2","microsoft/windows 11 23h2","microsoft/windows 11 24h2","microsoft/windows server 2022 23h2","microsoft/windows server 2025"],"epss":{"score":0.10066,"percentile":0.95621,"date":"2026-10-30","history":[]},"kev":{"listed":true,"dateAdded":"2025-01-14","dueDate":"2025-02-04","knownRansomwareCampaignUse":"Unknown","notes":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.\nhttps://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-21333 ; https://nvd.nist.gov/vuln/detail/CVE-2025-21333"},"exploits":{"count":1,"verified":false,"firstPublished":"2025-09-16","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":52436,"kind":"exploit","title":"Microsoft Windows Server 2025 Hyper-V NT Kernel Integration VSP - Elevation of Privilege","url":"https://www.exploit-db.com/exploits/52436","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/windows/local/52436.c","file":"exploits/windows/local/52436.c","published":"2025-09-16","added":"2025-09-16","updated":"2025-09-16","author":"Milad Karimi (Ex3ptionaL)","type":"local","platform":"windows","port":null,"verified":false,"codes":["CVE-2025-21333"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"urgent","text":"Known to be exploited in the wild (CISA KEV, CISA remediation deadline 4 February 2025). Treat as an emergency change: patch or isolate now, then hunt for prior compromise."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-10-21T00:00:00.000Z","detail":{"to":0.10066,"from":0.09988,"percentile":0.95619},"summary":"EPSS moved from 10.0% to 10.1% probability of exploitation in the next thirty days."}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21333","tags":["Patch","Vendor Advisory"],"source":"secure@microsoft.com"},{"url":"https://www.exploit-db.com/exploits/52436","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-detection-script","tags":["Mitigation","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-mitigation-script","tags":["Mitigation","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21333","tags":["US Government Resource"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-21333","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."}