{"id":"CVE-2021-38638","published":"2021-09-15T11:23:59Z","modified":"2026-08-10T15:10:52Z","title":"Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability","vendor":"Microsoft","product":"Windows 10 Version 1507","tier":"tail","description":{"text":"Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability","provenance":"source","from":"CVE.org"},"cvss":{"score":7.8,"severity":"HIGH","version":"3.1","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","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.00523,"percentile":0.44247,"provenance":"source"},"cwes":[{"id":"CWE-269","name":"Improper Privilege Management"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-38638","tags":["vendor-advisory","patch"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-38638","tags":["x_refsource_MISC","x_transferred"]}],"priority":{"score":14.3,"factors":[{"name":"EPSS percentile","points":8.85},{"name":"CVSS severity","points":5.46}]},"vendorSlug":"microsoft","affectedVersions":[{"vendor":"Microsoft","product":"Windows 10 Version 1507","versions":[">= 10.0.10240.0, < 10.0.10240.19060"]},{"vendor":"Microsoft","product":"Windows 10 Version 1607","versions":[">= 10.0.14393.0, < 10.0.14393.4651"]},{"vendor":"Microsoft","product":"Windows 10 Version 1809","versions":[">= 10.0.17763.0, < 10.0.17763.2183"]},{"vendor":"Microsoft","product":"Windows 10 Version 1809","versions":[">= 10.0.0, < 10.0.17763.2183"]},{"vendor":"Microsoft","product":"Windows 10 Version 1909","versions":[">= 10.0.0, < 10.0.18363.1801"]},{"vendor":"Microsoft","product":"Windows 10 Version 2004","versions":[">= 10.0.0, < 10.0.19041.1237"]},{"vendor":"Microsoft","product":"Windows 10 Version 20H2","versions":[">= 10.0.0, < 10.0.19042.1237"]},{"vendor":"Microsoft","product":"Windows 10 Version 21H1","versions":[">= 10.0.0, < 10.0.19043.1237"]},{"vendor":"Microsoft","product":"Windows 7","versions":[">= 6.1.0, < 6.1.7601.25712"]},{"vendor":"Microsoft","product":"Windows 7 Service Pack 1","versions":[">= 6.1.0, < 6.1.7601.25712"]}],"euvd":{"id":"EUVD-2021-25077","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-class-microsoft-windows-cwe-269"}}