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Tool Directory

CVE-2025-62221

HighPublished

Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability

Published: Dec 9, 2025
Updated: Apr 16, 2026
Assigning CNA: microsoft
Evidence observed: Dec 9, 2025

Primary CVSS

7.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

2.5%

Low · next 30 days

Percentile: 83.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

Use after free in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.

Sources

DEMO-Proof-of-Concept-Temporal-Memory-Inconsistency-in-cldflt.sys-CVE-2025-62221PoC
Proof-of-concept demonstrating a use-after-free in cldflt.sys (CVE-2025-62221) that enables local privilege escalation to SYSTEM via kernel pool grooming and token stealing.

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