CVE-2021-1732

Windows Win32k Elevation of Privilege Vulnerability

CVE-2021-1732 is fixed in 19 products on 1 platform, first by KB4601354, released February 9, 2021. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on November 3, 2021, with known ransomware use. Patch Radar priority: Patch now.

Patch nowCISA KEVKnown ransomware use

CVSS

7.8

Important

Exploitation

Exploited

Reported by the vendor

CISA KEV

Nov 3, 2021

Federal due date Nov 17, 2021. Known ransomware use

EPSS

0.7838

99th percentile

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows 10 Version 1803 for 32-bit Systems	17134.2026	KB4601354	Feb 9, 2021
Windows 10 Version 1803 for ARM64-based Systems	17134.2026	KB4601354	Feb 9, 2021
Windows 10 Version 1803 for x64-based Systems	17134.2026	KB4601354	Feb 9, 2021
Windows 10 Version 1809 for 32-bit Systems	17763.1757	KB4601345	Feb 9, 2021
Windows 10 Version 1809 for ARM64-based Systems	17763.1757	KB4601345	Feb 9, 2021
Windows 10 Version 1809 for x64-based Systems	17763.1757	KB4601345	Feb 9, 2021
Windows 10 Version 1909 for 32-bit Systems	18363.1377	KB4601315	Feb 9, 2021
Windows 10 Version 1909 for ARM64-based Systems	18363.1377	KB4601315	Feb 9, 2021
Windows 10 Version 1909 for x64-based Systems	18363.1377	KB4601315	Feb 9, 2021
Windows 10 Version 2004 for 32-bit Systems		KB4601319	Feb 9, 2021
Windows 10 Version 2004 for ARM64-based Systems		KB4601319	Feb 9, 2021
Windows 10 Version 2004 for x64-based Systems		KB4601319	Feb 9, 2021
Windows 10 Version 20H2 for 32-bit Systems		KB4601319	Feb 9, 2021
Windows 10 Version 20H2 for ARM64-based Systems		KB4601319	Feb 9, 2021
Windows Server 2019	17763.1757	KB4601345	Feb 9, 2021
Windows Server 2019 (Server Core installation)	17763.1757	KB4601345	Feb 9, 2021
Windows Server, version 1909 (Server Core installation)	18363.1377	KB4601315	Feb 9, 2021
Windows Server, version 2004 (Server Core installation)		KB4601319	Feb 9, 2021
Windows Server, version 20H2 (Server Core Installation)		KB4601319	Feb 9, 2021

Details

Published
February 9, 2021
CISA required action
Apply updates per vendor instructions.
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1732

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