high7.8Known exploited
CVE-2021-43226
Microsoft Windows Privilege Escalation Vulnerability
Exploited in the wild
This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2025-10-06. Federal due date: 2025-10-27.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Impact
Microsoft Windows Common Log File System Driver contains a privilege escalation vulnerability that could allow a local, privileged attacker to bypass certain security mechanisms.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Windows 10 1507 | before 10.0.10240.19145 |
| Microsoft | Windows 10 1607 | before 10.0.14393.4825 |
| Microsoft | Windows 10 1809 | before 10.0.17763.2366 |
| Microsoft | Windows 10 1909 | before 10.0.18363.1977 |
| Microsoft | Windows 10 2004 | before 10.0.19041.1415 |
| Microsoft | Windows 10 20h2 | before 10.0.19042.1415 |
| Microsoft | Windows 10 21h1 | before 10.0.19043.1415 |
| Microsoft | Windows 10 21h2 | before 10.0.19044.1415 |
| Microsoft | Windows 11 21h2 | before 10.0.22000.376 |
| Microsoft | Windows 7 | All versions |
| Microsoft | Windows 8.1 | All versions |
| Microsoft | Windows Rt 8.1 | All versions |