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7.8
CVSS
High

CVE-2021-40449

PUBLISHED

Win32k Elevation of Privilege Vulnerability

Exploited in the wild Used in malware Low complexity No user interaction
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)
Published
Oct 13, 2021
EPSS
—

Description

Win32k Elevation of Privilege Vulnerability

windows cisa malware ransomware metasploit microsoft

CVSS scores

CVSS v3.1 7.8 High

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

Exploitation status

Exploited in the wild

Recorded 2021-11-17 00:00:00 UTC · Source

Used in malware

Recorded 2021-11-17 00:00:00 UTC · Source

SSVC decision points

Exploitation
active
Automatable
No
Technical impact
total

References

Known exploited vulnerability sources

Catalogues that list this CVE as a known exploited vulnerability.

Source Added
CISA Nov 17, 2021
CISA Nov 17, 2021

Scanner integrations

Scanner Reference Detected
Metasploit https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/local/cve_2021_40449.rb Apr 28, 2025

Potential proof of concepts

These PoCs are unverified and could contain malware. Use at your own risk.

cve_2021_40449

metasploit · Created Unknown

Metasploit module for CVE-2021-40449

BL0odz/CVE-2021-40449-NtGdiResetDC-UAF

github · Created 2022-02-20 16:23:26 UTC · 9 stars

Kristal-g/CVE-2021-40449_poc

github · Created 2021-11-07 16:15:19 UTC · 52 stars

Exploit for CVE-2021-40449

hakivvi/CVE-2021-40449

github · Created 2021-10-25 04:58:49 UTC · 41 stars

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

KaLendsi/CVE-2021-40449-Exploit

github · Created 2021-10-20 09:24:36 UTC · 96 stars

windows 10 14393 LPE

Timeline

  • CVE ID Reserved

  • CVE Published to Public

  • Exploit Used in Malware

  • Added to KEVIntel

  • Added to KEVIntel

  • Detected by Metasploit