{"id":"CVE-2025-21334","aliases":["EUVD-2025-2399","GHSA-3hcq-fqcw-cvgf"],"status":"published","title":"Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability","description":"Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability","severity":{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.01573,"percentile":0.75745,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":false,"fix_available":false},"cwes":["CWE-416"],"published":"2025-01-14T18:04:51Z","modified":"2026-06-17T08:43:07Z","kev":{"date_added":"2025-01-14","due_date":"2025-02-04","required_action":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","known_ransomware_use":"Unknown"},"exploitation":[{"source":"euvd","since":"2025-01-14"},{"source":"kev","since":"2025-01-14"}],"products":[{"vendor":"microsoft","product":"windows"},{"vendor":"microsoft","product":"windows 10 version 21h2"},{"vendor":"microsoft","product":"windows 10 version 22h2"},{"vendor":"microsoft","product":"windows 11 version 22h2"},{"vendor":"microsoft","product":"windows 11 version 22h3"},{"vendor":"microsoft","product":"windows 11 version 23h2"},{"vendor":"microsoft","product":"windows 11 version 24h2"},{"vendor":"microsoft","product":"windows server 2022, 23h2 edition (server core installation)"},{"vendor":"microsoft","product":"windows server 2025"},{"vendor":"microsoft","product":"windows server 2025 (server core installation)"},{"vendor":"microsoft","product":"windows_10_21h2"},{"vendor":"microsoft","product":"windows_10_22h2"},{"vendor":"microsoft","product":"windows_11_22h2"},{"vendor":"microsoft","product":"windows_11_23h2"},{"vendor":"microsoft","product":"windows_11_24h2"},{"vendor":"microsoft","product":"windows_server_2022_23h2"},{"vendor":"microsoft","product":"windows_server_2025"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21334","tags":["vendor-advisory","patch","Patch","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21334","tags":["government-resource","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21334"},{"url":"https://github.com/advisories/GHSA-3hcq-fqcw-cvgf"}],"sources":{"cve":[{"id":"CVE-2025-21334","title":"Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability","description":"Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability","status":"published","published":"2025-01-14T18:04:51.608Z","modified":"2026-06-09T18:30:15.367Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:32:32.702673Z"}],"euvd":[{"id":"EUVD-2025-2399","description":"Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability","status":"published","published":"2025-01-14T18:04:51Z","modified":"2026-06-09T18:30:15Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high"}],"exploited_since":"2025-01-14","updated_at":"2026-11-02T18:20:46.299732Z"}],"ghsa":[{"id":"GHSA-3hcq-fqcw-cvgf","title":"Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability","description":"Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability","status":"published","published":"2025-01-14T18:32:05Z","modified":"2025-10-22T00:33:13Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T15:04:07.67458Z"}],"kev":[{"id":"CVE-2025-21334","title":"Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability","description":"Microsoft Windows Hyper-V NT Kernel Integration VSP contains a use-after-free vulnerability that allows a local attacker to gain SYSTEM privileges.","cwes":["CWE-416"],"kev":{"date_added":"2025-01-14","due_date":"2025-02-04","required_action":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","known_ransomware_use":"Unknown"},"updated_at":"2026-11-02T17:00:16.234141Z"}],"nvd":[{"id":"CVE-2025-21334","description":"Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability","status":"published","published":"2025-01-14T18:15:58.77Z","modified":"2026-06-17T08:43:07.783Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:10:48.713733Z"}]}}