CVE-2021-40450

Published: Oct 13, 2021Modified: Jun 17, 2026CISA KEV

7.8

Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitability: 1.8 / Impact: 5.9

Source: NVD (Secondary)

Description

Win32k Elevation of Privilege Vulnerability

Affected (10)

Products: Microsoft: Windows 10 1809, Windows 10 1909, Windows 10 2004, Windows 10 20h2, Windows 10 21h1, Windows 11 21h2, Windows Server 2004, Windows Server 2019, Windows Server 2022, Windows Server 20h2

10 products

Windows 10 1809

Windows 10 1909

Windows 10 2004

Windows 10 20h2

Windows 10 21h1

Windows 11 21h2

Windows Server 2004

Windows Server 2019

Windows Server 2022

Windows Server 20h2

Configuration A

10 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 10 1809	Before 10.0.17763.2237
Microsoft Windows 10 1909	Before 10.0.18363.1854
Microsoft Windows 10 2004	Before 10.0.19041.1288
Microsoft Windows 10 20h2	Before 10.0.19042.1288
Microsoft Windows 10 21h1	Before 10.0.19043.1288
Microsoft Windows 11 21h2	Before 10.0.22000.258
Microsoft Windows Server 2004	Before 10.0.19041.1288
Microsoft Windows Server 2019	Before 10.0.17763.2237
Microsoft Windows Server 2022	Before 10.0.20348.288
Microsoft Windows Server 20h2	Before 10.0.19042.1288

References (3)

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40450

Source: secure@microsoft.com

PatchVendor Advisory

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40450

Source: af854a3a-2127-422b-91ae-364da2661108

PatchVendor Advisory

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40450

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

US Government Resource

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