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CVE-2021-1732: Windows Win32k Elevation of Privilege Vulnerability

• Severity: medium (CVSS 4.6 v2.0)
• Exploited in the wild: yes — in CISA KEV since 2021-11-03
• EPSS: 78.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-02-25 · updated 2026-08-12
• Weakness: CWE-787

Description

Windows Win32k Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 10 1803: all versions
• Microsoft Windows 10: all versions
• Microsoft Windows 10 1909: all versions
• Microsoft Windows 10 2004: all versions
• Microsoft Windows 10 20H2: all versions
• Microsoft Windows Server 1909: all versions
• Microsoft Windows Server 2004: all versions
• Microsoft Windows Server 2019: all versions
• Microsoft Windows Server 20H2: all versions
• Microsoft Windows 10 1803: from 10.0.0 before publication — fixed in publication
• Microsoft Windows 10: from 10.0.0 before publication — fixed in publication
• Microsoft Windows 10 1909: from 10.0.0 before publication — fixed in publication
• Microsoft Windows 10 2004: from 10.0.0 before publication — fixed in publication
• Microsoft Windows 10 20H2: from 10.0.0 before publication — fixed in publication
• Microsoft Windows Server 2019: from 10.0.0 before publication — fixed in publication
• Microsoft Windows Server, version 1909 (Server Core installation): from 10.0.0 before publication — fixed in publication
• Microsoft Windows Server version 2004: from 10.0.0 before publication — fixed in publication
• Microsoft Windows Server version 20H2: from 10.0.0 before publication — fixed in publication

How to fix

Upgrade to a fixed version: Microsoft Windows 10 1803 publication; Microsoft Windows 10 publication; Microsoft Windows 10 1909 publication; Microsoft Windows 10 2004 publication; Microsoft Windows 10 20H2 publication; Microsoft Windows Server 2019 publication; Microsoft Windows Server, version 1909 (Server Core installation) publication; Microsoft Windows Server version 2004 publication; Microsoft Windows Server version 20H2 publication. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/161880/Win32k-ConsoleControl-Offset-Confusion.html
• http://packetstormsecurity.com/files/166169/Win32k-ConsoleControl-Offset-Confusion-Privilege-Escalation.html
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1732
• http://packetstormsecurity.com/files/161880/Win32k-ConsoleControl-Offset-Confusion.html
• http://packetstormsecurity.com/files/166169/Win32k-ConsoleControl-Offset-Confusion-Privilege-Escalation.html
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1732
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1732

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