CVE-2021-40449

Win32k Elevation of Privilege Vulnerability

Basic Information

CVE State: PUBLISHED
Reserved Date: September 02, 2021
Published Date: October 13, 2021
Last Updated: February 07, 2025
Vendor: Microsoft
Product: Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows 10 Version 1909, Windows 10 Version 21H1, Windows Server 2022, Windows 10 Version 2004, Windows Server version 2004, Windows 10 Version 20H2, Windows Server version 20H2, Windows 11 version 21H2, Windows 10 Version 1507, Windows 10 Version 1607, Windows Server 2016, Windows Server 2016 (Server Core installation), Windows 7, Windows 7 Service Pack 1, Windows 8.1, Windows Server 2008 Service Pack 2, Windows Server 2008 Service Pack 2 (Server Core installation), Windows Server 2008 Service Pack 2, Windows Server 2008 R2 Service Pack 1, Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation)
Description: Win32k Elevation of Privilege Vulnerability

CVSS Scores

CVSS v3.1

7.8 - HIGH

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

SSVC Information

Exploitation: active
Technical Impact: total

Exploit Status

Exploited in the Wild: Yes (added 2021-11-17 00:00:00 UTC) Source
Proof of Concept Available: Yes (added 2022-02-20 16:23:26 UTC) Source
Used in Malware: Yes (added 2021-11-17 00:00:00 UTC) Source

References

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

Known Exploited Vulnerability Information

Source	Added Date
CISA	2021-11-17 00:00:00 UTC

Scanner Integrations

Scanner	URL	Date Detected
Metasploit	https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/local/cve_2021_40449.rb	2025-04-29 11:01:40 UTC

Potential Proof of Concepts

Warning: These PoCs have not been tested and could contain malware. Use at your own risk.

cve_2021_40449

Type: metasploit • Created: Unknown

Metasploit module for CVE-2021-40449

BL0odz/CVE-2021-40449-NtGdiResetDC-UAF

Type: github • Created: 2022-02-20 16:23:26 UTC • Stars: 9

Kristal-g/CVE-2021-40449_poc

Type: github • Created: 2021-11-07 16:15:19 UTC • Stars: 52

Exploit for CVE-2021-40449

hakivvi/CVE-2021-40449

Type: github • Created: 2021-10-25 04:58:49 UTC • Stars: 41

LPE exploit for a UAF in Windows (CVE-2021-40449).

KaLendsi/CVE-2021-40449-Exploit

Type: github • Created: 2021-10-20 09:24:36 UTC • Stars: 96

windows 10 14393 LPE