CVE-2026-21241

{"id": "CVE-2026-21241", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "secure@microsoft.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.0, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.0}]}, "published": "2026-02-10T18:16:25.150", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21241", "tags": ["Vendor Advisory"], "source": "secure@microsoft.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "secure@microsoft.com", "description": [{"lang": "en", "value": "CWE-416"}]}], "descriptions": [{"lang": "en", "value": "Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally."}], "lastModified": "2026-02-11T20:57:27.187", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*", "vulnerable": true, "matchCriteriaId": "B273EF5A-3157-4842-AE91-CEC289813902", "versionEndExcluding": "10.0.22631.6649"}, {"criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*", "vulnerable": true, "matchCriteriaId": "CD2513FC-D399-4DBF-921F-13B4D1497127", "versionEndExcluding": "10.0.22631.6649"}, {"criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*", "vulnerable": true, "matchCriteriaId": "B08450A0-0F7E-4A05-8989-900221992766", "versionEndExcluding": "10.0.26100.7781"}, {"criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*", "vulnerable": true, "matchCriteriaId": "9D30B348-DAE7-43EC-85FA-38E1715258A9", "versionEndExcluding": "10.0.26100.7781"}, {"criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*", "vulnerable": true, "matchCriteriaId": "8F23FFCF-9C69-4D27-AF21-D09A6041AA3A", "versionEndExcluding": "10.0.26200.7781"}, {"criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*", "vulnerable": true, "matchCriteriaId": "D1D93202-BDDB-438F-934E-1FE904B3651B", "versionEndExcluding": "10.0.26200.7781"}, {"criteria": "cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9E19FC4B-C3CC-4924-9A0B-5E4F100280D4", "versionEndExcluding": "10.0.20348.4711"}, {"criteria": "cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F0EA3C51-C3FE-494A-92D9-D3B1C301CB54", "versionEndExcluding": "10.0.25398.2149"}, {"criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "33AF95F4-504F-40EF-9F64-5D6F7B40114F", "versionEndExcluding": "10.0.26100.32313"}], "operator": "OR"}]}], "sourceIdentifier": "secure@microsoft.com"}