Windows
CVE-2025-24985
HIGH
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
5DescriptionCVE.org
Integer overflow or wraparound in Windows Fast FAT Driver allows an unauthorized attacker to execute code locally.
AnalysisAI
An integer overflow in the Windows Fast FAT Driver allows unauthenticated local code execution through crafted FAT filesystem images. KEV-listed with public PoC, this vulnerability (CVE-2025-24985) can be triggered by mounting a malicious USB drive or VHD file, making it a potent vector for physical access attacks and social engineering scenarios.
Technical ContextAI
The Windows Fast FAT filesystem driver (fastfat.sys) fails to properly validate integer arithmetic when processing FAT directory entries. An attacker-controlled integer value overflows during size calculation, resulting in an undersized kernel pool allocation. Subsequent data copy overwrites adjacent kernel memory. Because filesystem drivers operate in kernel mode, successful exploitation yields SYSTEM-level code execution.
Affected ProductsAI
Microsoft Windows 10 (all versions) Microsoft Windows 11 Microsoft Windows Server 2016/2019/2022
RemediationAI
Apply Microsoft security update immediately. Disable AutoPlay for removable media. Consider blocking VHD file attachments at email gateway. Group Policy: restrict mounting of removable media on sensitive systems.
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External POC / Exploit Code
Leaving vuln.today