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CVE-2021-40449

Known Exploited (CISA KEV)HIGH
7.8
CVSS Severity Score
EPSS Score70.9480%
EPSS Percentile85.31th
PublishedOct 13, 2021
Last ModifiedOct 30, 2025

Vulnerability Description

Win32k Elevation of Privilege Vulnerability

Affected Platforms (CPE)

💻
Microsoft

Windows 10 1507

< 10.0.10240.19086
💻
Microsoft

Windows 10 1607

< 10.0.14393.4704
💻
Microsoft

Windows 10 1809

< 10.0.17763.2237
💻
Microsoft

Windows 10 1909

< 10.0.18363.1854
💻
Microsoft

Windows 10 2004

< 10.0.19041.1288
💻
Microsoft

Windows 10 20h2

< 10.0.19041.1288
💻
Microsoft

Windows 10 21h1

< 10.0.19041.1288
💻
Microsoft

Windows 11

All versions
💻
Microsoft

Windows 11 21h2

< 10.0.22000.258
💻
Microsoft

Windows 7

All versions
💻
Microsoft

Windows 8.1

All versions
💻
Microsoft

Windows Rt 8.1

All versions
💻
Microsoft

Windows Server 2004

< 10.0.19041.1288
💻
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

< 10.0.14393.4704
💻
Microsoft

Windows Server 2019

< 10.0.17763.2237
💻
Microsoft

Windows Server 2022

< 10.0.20348.288
💻
Microsoft

Windows Server 20h2

< 10.0.19042.1288

References & Advisories

🔗 http://packetstormsecurity.com/files/164926/Win32k-NtGdiResetDC-Use-After-Free-Local-Privilege-Escalation.html
🔗 https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40449
🔗 http://packetstormsecurity.com/files/164926/Win32k-NtGdiResetDC-Use-After-Free-Local-Privilege-Escalation.html
🔗 https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40449
🔗 https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40449

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