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.

Affected

Microsoft · Windows 10 Version 1507 · Windows 10 Version 1607 · Windows 10 Version 1809 · Windows 10 Version 21H2 · Windows 10 Version 22H2 · Windows 11 version 22H2

CVSS v3.1 MICROSOFT

7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

0.56% chance of exploitation in the next 30 days, 45th percentile

Published

2025-07-08

Updated

2026-02-13

Proof-of-concept exploits (1)

• Lam0x0/FASTFAT_Crash_from_Cache_PoC0★ · 2025-07-20

Security advisories

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49721

References

• CVE Record
• NVD entry