{"id":"CVE-2021-36955","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 < 10.0.10240.19060","windows_10_1607 < 10.0.14393.4651","windows_10_1809 < 10.0.17763.2183","windows_10_1909 < 10.0.18363.1801","windows_10_2004 < 10.0.19041.1237","windows_10_20h2 < 10.0.19042.1237","windows_10_21h1 < 10.0.19043.1237","windows_7","windows_8.1","windows_rt_8.1","windows_server_2004 < 10.0.19041.1237","windows_server_2008","windows_server_2008 = r2","windows_server_2012","windows_server_2016 < 10.0.14393.4651","windows_server_2019 < 10.0.17763.2183","windows_server_2022 < 10.0.20348.230","windows_server_20h2 < 10.0.19042.1237"],"patched":["windows_10_1507 10.0.10240.19060","windows_10_1607 10.0.14393.4651","windows_10_1809 10.0.17763.2183","windows_10_1909 10.0.18363.1801","windows_10_2004 10.0.19041.1237","windows_10_20h2 10.0.19042.1237","windows_10_21h1 10.0.19043.1237","windows_server_2004 10.0.19041.1237","windows_server_2016 10.0.14393.4651","windows_server_2019 10.0.17763.2183","windows_server_2022 10.0.20348.230","windows_server_20h2 10.0.19042.1237"],"published":"2021-09-15","updated":"2026-08-10","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-36955","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36955","label":"secure@microsoft.com"},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36955","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36955","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","kev","in-the-wild","exploit-available"],"epss":0.04037,"epssPercentile":0.90174,"kev":true,"kevDateAdded":"2021-11-03","kevDueDate":"2021-11-17","kevRansomware":true,"exploited":true,"ingestedAt":"2026-08-11T16:47:01.213Z","exploits":{"github":1,"githubRepos":["https://github.com/JiaJinRong12138/CVE-2021-36955-EXP"],"checkedAt":"2026-09-24T07:52:48.168Z"},"exploitAvailable":true,"slug":"CVE-2021-36955","body":"## Overview\n\nWindows Common Log File System Driver Elevation of Privilege Vulnerability\n\n## Affected\n\n- `windows_10_1507 < 10.0.10240.19060`\n- `windows_10_1607 < 10.0.14393.4651`\n- `windows_10_1809 < 10.0.17763.2183`\n- `windows_10_1909 < 10.0.18363.1801`\n- `windows_10_2004 < 10.0.19041.1237`\n- `windows_10_20h2 < 10.0.19042.1237`\n- `windows_10_21h1 < 10.0.19043.1237`\n- `windows_7`\n- `windows_8.1`\n- `windows_rt_8.1`\n- `windows_server_2004 < 10.0.19041.1237`\n- `windows_server_2008`\n- `windows_server_2008 = r2`\n- `windows_server_2012`\n- `windows_server_2016 < 10.0.14393.4651`\n- `windows_server_2019 < 10.0.17763.2183`\n- `windows_server_2022 < 10.0.20348.230`\n- `windows_server_20h2 < 10.0.19042.1237`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `windows_10_1507 10.0.10240.19060`\n- `windows_10_1607 10.0.14393.4651`\n- `windows_10_1809 10.0.17763.2183`\n- `windows_10_1909 10.0.18363.1801`\n- `windows_10_2004 10.0.19041.1237`\n- `windows_10_20h2 10.0.19042.1237`\n- `windows_10_21h1 10.0.19043.1237`\n- `windows_server_2004 10.0.19041.1237`\n- `windows_server_2016 10.0.14393.4651`\n- `windows_server_2019 10.0.17763.2183`\n- `windows_server_2022 10.0.20348.230`\n- `windows_server_20h2 10.0.19042.1237`","depth":"abyssal","depthScore":74,"depthScoreParts":{"impact":42.9,"likelihood":0.8,"exploitation":25,"ransomware":5},"changes":[{"seq":4532,"id":"CVE-2021-36955","ts":1788887188052,"field":"exploit_available","old":"false","new":"true"},{"seq":3415,"id":"CVE-2021-36955","ts":1788886305703,"field":"exploit_available","old":"true","new":"false"},{"seq":2270,"id":"CVE-2021-36955","ts":1788882975192,"field":"exploit_available","old":"false","new":"true"},{"seq":1299,"id":"CVE-2021-36955","ts":1788882387004,"field":"exploit_available","old":"true","new":"false"},{"seq":413,"id":"CVE-2021-36955","ts":1788881822860,"field":"exploit_available","old":"false","new":"true"}]}