{"id":"CVE-2021-43226","title":"Windows Common Log File System Driver Elevation of Privilege Vulnerability","summary":"Windows Common Log File System Driver Elevation of Privilege Vulnerability","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"microsoft","product":"windows_10_1507","affected":["windows_10_1507 < 10.0.10240.19145","windows_10_1607 < 10.0.14393.4825","windows_10_1809 < 10.0.17763.2366","windows_10_1909 < 10.0.18363.1977","windows_10_2004 < 10.0.19041.1415","windows_10_20h2 < 10.0.19042.1415","windows_10_21h1 < 10.0.19043.1415","windows_10_21h2 < 10.0.19044.1415","windows_11_21h2 < 10.0.22000.376","windows_7","windows_8.1","windows_rt_8.1","windows_server_2004 < 10.0.19041.1415","windows_server_2008","windows_server_2008 = r2","windows_server_2012","windows_server_2012 = r2","windows_server_2016 < 10.0.14393.4825","windows_server_2019 < 10.0.17763.2366","windows_server_2022 < 10.0.20348.405","windows_server_20h2 < 10.0.19042.1415"],"patched":["windows_10_1507 10.0.10240.19145","windows_10_1607 10.0.14393.4825","windows_10_1809 10.0.17763.2366","windows_10_1909 10.0.18363.1977","windows_10_2004 10.0.19041.1415","windows_10_20h2 10.0.19042.1415","windows_10_21h1 10.0.19043.1415","windows_10_21h2 10.0.19044.1415","windows_11_21h2 10.0.22000.376","windows_server_2004 10.0.19041.1415","windows_server_2016 10.0.14393.4825","windows_server_2019 10.0.17763.2366","windows_server_2022 10.0.20348.405","windows_server_20h2 10.0.19042.1415"],"published":"2021-12-15","updated":"2026-08-22","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-43226","references":[{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43226","label":"secure@microsoft.com"},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43226","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-43226","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","kev","in-the-wild","exploit-available"],"epss":0.03072,"epssPercentile":0.87102,"kev":true,"kevDateAdded":"2025-10-06","kevDueDate":"2025-10-27","kevRansomware":true,"exploited":true,"ingestedAt":"2026-08-22T04:26:54.378Z","exploits":{"github":1,"githubRepos":["https://github.com/Rosayxy/cve-2021-43226PoC"],"checkedAt":"2026-09-25T08:20:39.891Z"},"exploitAvailable":true,"slug":"CVE-2021-43226","body":"## Overview\n\nWindows Common Log File System Driver Elevation of Privilege Vulnerability\n\n## Affected\n\n- `windows_10_1507 < 10.0.10240.19145`\n- `windows_10_1607 < 10.0.14393.4825`\n- `windows_10_1809 < 10.0.17763.2366`\n- `windows_10_1909 < 10.0.18363.1977`\n- `windows_10_2004 < 10.0.19041.1415`\n- `windows_10_20h2 < 10.0.19042.1415`\n- `windows_10_21h1 < 10.0.19043.1415`\n- `windows_10_21h2 < 10.0.19044.1415`\n- `windows_11_21h2 < 10.0.22000.376`\n- `windows_7`\n- `windows_8.1`\n- `windows_rt_8.1`\n- `windows_server_2004 < 10.0.19041.1415`\n- `windows_server_2008`\n- `windows_server_2008 = r2`\n- `windows_server_2012`\n- `windows_server_2012 = r2`\n- `windows_server_2016 < 10.0.14393.4825`\n- `windows_server_2019 < 10.0.17763.2366`\n- `windows_server_2022 < 10.0.20348.405`\n- `windows_server_20h2 < 10.0.19042.1415`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `windows_10_1507 10.0.10240.19145`\n- `windows_10_1607 10.0.14393.4825`\n- `windows_10_1809 10.0.17763.2366`\n- `windows_10_1909 10.0.18363.1977`\n- `windows_10_2004 10.0.19041.1415`\n- `windows_10_20h2 10.0.19042.1415`\n- `windows_10_21h1 10.0.19043.1415`\n- `windows_10_21h2 10.0.19044.1415`\n- `windows_11_21h2 10.0.22000.376`\n- `windows_server_2004 10.0.19041.1415`\n- `windows_server_2016 10.0.14393.4825`\n- `windows_server_2019 10.0.17763.2366`\n- `windows_server_2022 10.0.20348.405`\n- `windows_server_20h2 10.0.19042.1415`","depth":"abyssal","depthScore":74,"depthScoreParts":{"impact":42.9,"likelihood":0.6,"exploitation":25,"ransomware":5},"changes":[{"seq":4551,"id":"CVE-2021-43226","ts":1788887189744,"field":"exploit_available","old":"false","new":"true"},{"seq":3434,"id":"CVE-2021-43226","ts":1788886306989,"field":"exploit_available","old":"true","new":"false"},{"seq":2289,"id":"CVE-2021-43226","ts":1788882976702,"field":"exploit_available","old":"false","new":"true"},{"seq":1318,"id":"CVE-2021-43226","ts":1788882388668,"field":"exploit_available","old":"true","new":"false"},{"seq":432,"id":"CVE-2021-43226","ts":1788881824261,"field":"exploit_available","old":"false","new":"true"}]}