CVE-2021-43226 Microsoft Windows Privilege Escalation
An attacker can exploit a flaw in the Windows Common Log File System Driver to elevate privileges on affected Windows systems.
- Exploited in the wild
- Since 6 Oct 2025
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-43226?
CVE-2021-43226 is a high-severity vulnerability in Microsoft Windows 10 1507, published on 15 Dec 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Windows Common Log File System Driver Elevation of Privilege Vulnerability
Which versions are affected by CVE-2021-43226?
It affects 19 products.
Products include Microsoft Windows 10 1507, Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 1909, Microsoft Windows 10 2004, Microsoft Windows 10 20h2 and 13 more.
How do I fix CVE-2021-43226?
No fix has been published for CVE-2021-43226 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 27 Oct 2025.
Is CVE-2021-43226 being exploited?
Yes. Attackers have exploited CVE-2021-43226 in the wild since at least 6 Oct 2025, including in ransomware campaigns.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Microsoft Windows 10 1507
- CVE-2017-8543 Microsoft Windows Search Remote Code Execution
- CVE-2025-33053 Microsoft Windows External Control of File Name or Path
- CVE-2025-33073 Microsoft Windows SMB Client Improper Access Control
- CVE-2024-49039 Microsoft Windows Task Scheduler Privilege Escalation
- CVE-2024-43461 Microsoft Windows MSHTML Platform Spoofing
Sources
Also known as GHSA-98jh-5xvm-p5ph.