CVE-2025-21271 Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
An attacker can exploit a buffer overread in the Windows Cloud Files Mini Filter Driver to elevate privileges on affected Windows systems.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-21271?
CVE-2025-21271 is a high-severity vulnerability in Microsoft Windows 10 1809, published on 14 Jan 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
Weakness: CWE-126
Which versions are affected by CVE-2025-21271?
It affects 5 products.
Products include Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows Server 2019, Microsoft Windows Server 2022.
How do I fix CVE-2025-21271?
No fix has been published for CVE-2025-21271 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-21271 being exploited?
There is no known exploitation of CVE-2025-21271 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 10 1809
- CVE-2024-29988 Microsoft SmartScreen Prompt Security Feature Bypass
- CVE-2024-21412 Microsoft Windows Internet Shortcut Files Security Feature Bypass
- CVE-2025-62221 Microsoft Windows Use After Free
- CVE-2025-30400 Microsoft Windows DWM Core Library Use-After-Free
- CVE-2024-21338 Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control
Sources
Also known as GHSA-3fqg-54mc-wmg3.