CVE-2021-40449

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 (21)

Products: Microsoft: Windows 10 1507, Windows 10 1607, Windows 10 1809, Windows 10 1909, Windows 10 2004, Windows 10 20h2, Windows 10 21h1, Windows 11, Windows 11 21h2, Windows 7, Windows 8.1, Windows Rt 8.1, Windows Server 2004, Windows Server 2008, Windows Server 2012, Windows Server 2016, Windows Server 2019, Windows Server 2022, Windows Server 20h2

Configuration A

21 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 10 1507	Before 10.0.10240.19086
Microsoft Windows 10 1607	Before 10.0.14393.4704
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 10.0.19041.1288
Microsoft Windows 10 21h1	Before 10.0.19041.1288
Microsoft Windows 11	All versions
Microsoft Windows 11 21h2	Before 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	Before 10.0.19041.1288
Microsoft Windows Server 2008	All versions
Microsoft Windows Server 2008	Version r2 sp1
Microsoft Windows Server 2012	All versions
Microsoft Windows Server 2012	Version r2
Microsoft Windows Server 2016	Before 10.0.14393.4704
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

Related CWEs

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (5)

http://packetstormsecurity.com/files/164926/Win32k-NtGdiResetDC-Use-After-Free-Local-Privilege-Escalation.html

Source: secure@microsoft.com

ExploitThird Party AdvisoryVDB Entry

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40449

Source: secure@microsoft.com

PatchVendor Advisory

http://packetstormsecurity.com/files/164926/Win32k-NtGdiResetDC-Use-After-Free-Local-Privilege-Escalation.html

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

ExploitThird Party AdvisoryVDB Entry

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40449

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

PatchVendor Advisory

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40449

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

US Government Resource

Timeline

No history available yet.