Threats / Microsoft / CVE-2025-24985
CVE-2025-24985
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Microsoft Windows vulnerability
Microsoft Windows Fast FAT File System Driver contains an integer overflow vulnerability allowing local code execution. The flaw has been exploited in the wild.
Verdict
Today item — known-exploited.
A local attacker can trigger an integer overflow in the Fast FAT driver to achieve arbitrary code execution on affected Windows systems. Active exploitation in the wild elevates risk despite low EPSS score.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
6 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-03-11).
Probability (EPSS)
EPSS 0.03705 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Microsoft, Windows. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-190 Integer Overflow, CWE-122 Heap-based Buffer Overflow — weakness family: Memory safety.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious file or filesystem interaction that triggers an integer overflow in the Fast FAT driver's buffer handling logic.
Business
An attacker gains local code execution with kernel privileges, enabling complete system compromise and lateral movement within the network.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I escalate from user-mode access to kernel-mode execution by exploiting the memory corruption resulting from the integer wraparound.
Business
Attackers bypass security controls and gain persistent access to sensitive data, systems, and credentials across the organization.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05