CVE-2021-43226Windows Common Log File System Driver Elevation of Privilege Vulnerability

In plain English

A high-severity security flaw in Windows 10 Version 1507 from Microsoft. Attackers are actively exploiting it in the wild (listed by CISA on October 6, 2025). It has been used in ransomware campaigns. The chance it is exploited in the next 30 days is estimated at 3.3% (higher than 88% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.