CVE-2025-62221: Microsoft Windows Use After Free Vulnerability

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: yes — in CISA KEV since 2025-12-09
EPSS: 2.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-12-09 · updated 2026-09-25
Weakness: CWE-416

Description

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

Affected products

Microsoft Windows 10: before 10.0.17763.8146 — fixed in 10.0.17763.8146
Microsoft Windows 10: before 10.0.19044.6691 — fixed in 10.0.19044.6691
Microsoft Windows 10: before 10.0.19045.6691 — fixed in 10.0.19045.6691
Microsoft Windows 11: before 10.0.22631.6345 — fixed in 10.0.22631.6345
Microsoft Windows 11: before 10.0.26100.7392 — fixed in 10.0.26100.7392
Microsoft Windows 11 25H2: before 10.0.26200.7392 — fixed in 10.0.26200.7392
Microsoft Windows Server 2019: before 10.0.17763.8146 — fixed in 10.0.17763.8146
Microsoft Windows Server 2022: before 10.0.20348.4467 — fixed in 10.0.20348.4467
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): before 10.0.25398.2025 — fixed in 10.0.25398.2025
Microsoft Windows Server 2025: before 10.0.26100.7392 — fixed in 10.0.26100.7392

How to fix

Upgrade to a fixed version: Microsoft Windows 10 10.0.17763.8146; Microsoft Windows 10 10.0.19044.6691; Microsoft Windows 10 10.0.19045.6691; Microsoft Windows 11 10.0.22631.6345; Microsoft Windows 11 10.0.26100.7392; Microsoft Windows 11 25H2 10.0.26200.7392; Microsoft Windows Server 2019 10.0.17763.8146; Microsoft Windows Server 2022 10.0.20348.4467; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2025; Microsoft Windows Server 2025 10.0.26100.7392. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2025-62221 or the next vulnerability affects your stack