Microsoft Windows Privilege Escalation Vulnerability
Microsoft — Windows
- Added to KEV catalog
- 6 October 2025
- Federal remediation due date
- 27 October 2025
CISA Description
Microsoft Windows Common Log File System Driver contains a privilege escalation vulnerability that could allow a local, privileged attacker to bypass certain security mechanisms.
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Notes
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-43226 ; https://nvd.nist.gov/vuln/detail/CVE-2021-43226
More Microsoft Vulnerabilities
Microsoft SharePoint Code Injection Vulnerability
Microsoft Windows Link Following Vulnerability
Microsoft Windows Heap-Based Buffer Overflow Vulnerability
Microsoft SQL Server Remote Code Execution Vulnerability
Microsoft Internet Key Exchange (IKE) Service Extensions Double Free Vulnerability
Is this vulnerability present in your environment?
CRS delivers independent VAPT assessments that identify exactly which known-exploited vulnerabilities exist in your network, applications, and infrastructure.
Explore VAPT Services