{"id":"CVE-2021-42278","title":"Active Directory Domain Services Elevation of Privilege Vulnerability","summary":"Active Directory Domain Services Elevation of Privilege Vulnerability","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"microsoft","product":"windows_server_2004","affected":["windows_server_2004 < 10.0.19041.1348","windows_server_2008","windows_server_2008 = r2","windows_server_2012","windows_server_2012 = r2","windows_server_2016 < 10.0.14393.4770","windows_server_2019 < 10.0.17763.2300","windows_server_2022 < 10.0.20348.350","windows_server_20h2 < 10.0.19042.1348"],"patched":["windows_server_2004 10.0.19041.1348","windows_server_2016 10.0.14393.4770","windows_server_2019 10.0.17763.2300","windows_server_2022 10.0.20348.350","windows_server_20h2 10.0.19042.1348"],"published":"2021-11-10","updated":"2026-08-06","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-42278","references":[{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42278","label":"secure@microsoft.com"},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42278","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42278","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","kev","in-the-wild","exploit-available"],"epss":0.73297,"epssPercentile":0.99451,"kev":true,"kevDateAdded":"2022-04-11","kevDueDate":"2022-05-02","kevRansomware":true,"exploited":true,"ingestedAt":"2026-08-06T05:56:20.344Z","exploits":{"github":6,"githubRepos":["https://github.com/safebuffer/sam-the-admin","https://github.com/Ridter/noPac","https://github.com/waterrr/noPac"],"checkedAt":"2026-09-21T15:24:33.112Z"},"exploitAvailable":true,"slug":"CVE-2021-42278","body":"## Overview\n\nActive Directory Domain Services Elevation of Privilege Vulnerability\n\n## Affected\n\n- `windows_server_2004 < 10.0.19041.1348`\n- `windows_server_2008`\n- `windows_server_2008 = r2`\n- `windows_server_2012`\n- `windows_server_2012 = r2`\n- `windows_server_2016 < 10.0.14393.4770`\n- `windows_server_2019 < 10.0.17763.2300`\n- `windows_server_2022 < 10.0.20348.350`\n- `windows_server_20h2 < 10.0.19042.1348`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `windows_server_2004 10.0.19041.1348`\n- `windows_server_2016 10.0.14393.4770`\n- `windows_server_2019 10.0.17763.2300`\n- `windows_server_2022 10.0.20348.350`\n- `windows_server_20h2 10.0.19042.1348`","depth":"abyssal","depthScore":86,"depthScoreParts":{"impact":41.3,"likelihood":14.7,"exploitation":25,"ransomware":5},"changes":[{"seq":4547,"id":"CVE-2021-42278","ts":1788887189719,"field":"exploit_available","old":"false","new":"true"},{"seq":3430,"id":"CVE-2021-42278","ts":1788886306964,"field":"exploit_available","old":"true","new":"false"},{"seq":2285,"id":"CVE-2021-42278","ts":1788882976679,"field":"exploit_available","old":"false","new":"true"},{"seq":1314,"id":"CVE-2021-42278","ts":1788882388643,"field":"exploit_available","old":"true","new":"false"},{"seq":428,"id":"CVE-2021-42278","ts":1788881824230,"field":"exploit_available","old":"false","new":"true"}]}