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CVE-2021-42278

Known Exploited (CISA KEV)HIGH
7.5
CVSS Severity Score
EPSS Score91.7120%
EPSS Percentile91.67th
PublishedNov 10, 2021
Last ModifiedOct 30, 2025

Vulnerability Description

Active Directory Domain Services Elevation of Privilege Vulnerability

Affected Platforms (CPE)

💻
Microsoft

Windows Server 2004

< 10.0.19041.1348
💻
Microsoft

Windows Server 2008

All versions
💻
Microsoft

Windows Server 2008

= r2
💻
Microsoft

Windows Server 2012

All versions
💻
Microsoft

Windows Server 2012

= r2
💻
Microsoft

Windows Server 2016

< 10.0.14393.4770
💻
Microsoft

Windows Server 2019

< 10.0.17763.2300
💻
Microsoft

Windows Server 2022

< 10.0.20348.350
💻
Microsoft

Windows Server 20h2

< 10.0.19042.1348

References & Advisories

🔗 https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42278
🔗 https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42278
🔗 https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42278

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