CVE-2021-40449
HighPublished
Win32k Elevation of Privilege Vulnerability
- Published
- Oct 13, 2021
- Updated
- Oct 21, 2025
- Assigning CNA
- microsoft
- Evidence observed
- Nov 17, 2021
Primary CVSS
7.8/ 10High
nvd · CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H74.1%
High · next 30 days
- Percentile
- 99.5%
- Model date
- Oct 17, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
Summary
Win32k Elevation of Privilege Vulnerability
Sources
Repository evidence: Files: 1 · Repositories: 1
1 Module
modules/exploits/windows/local/cve_2021_40449.rb
Metasploit Framework modulesDeclared conditions
- platform: Windows($.exploit_windows/local/cve_2021_40449.platform)
- verification: check_declared($.exploit_windows/local/cve_2021_40449.check)
Proof-of-concept exploit for CVE-2021-40449, a Windows kernel use-after-free in NtGdiResetDC, demonstrating privilege escalation via user-space memory allocation.
- CVE-2021-40449Exploit
Responsible use
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