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CVE-2025-49721 · Windows Fast FAT File System Driver Elevation of Privilege Vulnerability

Heap-based buffer overflow in Windows Fast FAT Driver allows an unauthorized attacker to elevate privileges locally.

Severity
Important
Impact
Elevation of Privilege
CVSS
7.8 base · 6.8 temporal
Release
2025-07-08
Signals
Windows Fast FAT Driver Elevation of Privilege Exploited: No Publicly disclosed: No Exploitability: Exploitation Less Likely
CWE
CWE-122: Heap-based Buffer Overflow
Patch Diff
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Description
Heap-based buffer overflow in Windows Fast FAT Driver allows an unauthorized attacker to elevate privileges locally.
FAQ / Articles
FAQ
According to the CVSS metric, the attack vector is local (AV:L) while user interaction is required (UI:R). What does that mean for this vulnerability? An attacker can trick a local user on a vulnerable system into mounting a specially crafted VHD that would then trigger the vulnerability.
FAQ
What privileges could be gained by an attacker who successfully exploited this vulnerability? An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.
Windows Fast FAT Driver Elevation of Privilege Vulnerability
Heap-based buffer overflow in Windows Fast FAT Driver allows an authorized attacker to elevate privileges locally.
Windows Fast FAT Driver Elevation of Privilege Vulnerability
Heap-based buffer overflow in Windows Fast FAT Driver allows an unauthorized attacker to elevate privileges locally.