{"id":"CVE-2021-41357","aliases":["EUVD-2021-28385","GHSA-pph6-grp2-wvvw"],"status":"published","title":"Win32k Elevation of Privilege Vulnerability","description":"Win32k 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:F/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.01523,"percentile":0.74807,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":false,"fix_available":false},"cwes":["CWE-269"],"published":"2021-10-13T00:28:21Z","modified":"2026-06-17T04:08:24Z","kev":{"date_added":"2022-04-25","due_date":"2022-05-16","required_action":"Apply updates per vendor instructions.","known_ransomware_use":"Unknown"},"exploitation":[{"source":"euvd","since":"2022-04-25"},{"source":"kev","since":"2022-04-25"}],"products":[{"vendor":"microsoft","product":"win32k"},{"vendor":"microsoft","product":"windows 10 version 2004"},{"vendor":"microsoft","product":"windows 10 version 20h2"},{"vendor":"microsoft","product":"windows 10 version 21h1"},{"vendor":"microsoft","product":"windows 11 version 21h2"},{"vendor":"microsoft","product":"windows server 2022"},{"vendor":"microsoft","product":"windows server version 2004"},{"vendor":"microsoft","product":"windows server version 20h2"},{"vendor":"microsoft","product":"windows_10_2004"},{"vendor":"microsoft","product":"windows_10_20h2"},{"vendor":"microsoft","product":"windows_10_21h1"},{"vendor":"microsoft","product":"windows_11_21h2"},{"vendor":"microsoft","product":"windows_server_2004"},{"vendor":"microsoft","product":"windows_server_2022"},{"vendor":"microsoft","product":"windows_server_20h2"}],"references":[{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41357","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-41357","tags":["government-resource","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-41357"},{"url":"https://github.com/advisories/GHSA-pph6-grp2-wvvw"}],"sources":{"cve":[{"id":"CVE-2021-41357","title":"Win32k Elevation of Privilege Vulnerability","description":"Win32k Elevation of Privilege Vulnerability","status":"published","published":"2021-10-13T00:28:21Z","modified":"2025-10-21T23:25:28.831Z","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:F/RL:O/RC:C","level":"high","assessor":"cna"}],"updated_at":"2026-11-02T14:32:59.430294Z"}],"euvd":[{"id":"EUVD-2021-28385","description":"Win32k Elevation of Privilege Vulnerability","status":"published","published":"2021-10-13T00:28:21Z","modified":"2025-10-21T23:25:28Z","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:F/RL:O/RC:C","level":"high"}],"exploited_since":"2022-04-25","updated_at":"2026-11-02T20:31:25.901288Z"}],"ghsa":[{"id":"GHSA-pph6-grp2-wvvw","title":"Win32k Elevation of Privilege Vulnerability This CVE ID is unique from CVE-2021-40449, CVE-2021...","description":"Win32k Elevation of Privilege Vulnerability This CVE ID is unique from CVE-2021-40449, CVE-2021-40450.","status":"published","published":"2022-05-24T19:17:27Z","modified":"2025-10-22T00:32:26Z","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-269"],"updated_at":"2026-11-02T15:04:05.344883Z"}],"kev":[{"id":"CVE-2021-41357","title":"Microsoft Win32k Privilege Escalation Vulnerability","description":"Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation.","kev":{"date_added":"2022-04-25","due_date":"2022-05-16","required_action":"Apply updates per vendor instructions.","known_ransomware_use":"Unknown"},"updated_at":"2026-11-02T17:00:16.541131Z"}],"nvd":[{"id":"CVE-2021-41357","description":"Win32k Elevation of Privilege Vulnerability","status":"published","published":"2021-10-13T01:15:13.95Z","modified":"2026-06-17T04:08:24.537Z","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"},{"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"},{"version":"2.0","score":4.6,"vector":"AV:L/AC:L/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:59.689345Z"}]}}