CVE-2025-62221
HighExploitedPublic exploitWindows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
Published Dec 8, 2025 · Updated Sep 25, 2026
Key Facts
Patch immediately- CVE-2025-62221 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Windows 10 1809 (Microsoft), Windows 10 21h2 (Microsoft), Windows 10 22h2 (Microsoft) and 17 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Dec 9, 2025. Public exploit code is available.
- EPSS estimates a 2.5% probability of exploitation in the next 30 days.
- Fixed versions are available, including Windows 10 1809 10.0.17763.8146, Windows 10 21h2 10.0.19044.6691, Windows 10 22h2 10.0.19045.6691.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
2.5%
Higher than 84.4% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2025-62221 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Use after free in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Dec 9, 2025 | Dec 30, 2025 | Not reported |
| Industry KEV feed | Dec 9, 2025 | Dec 30, 2025 | Not reported |
| CIRCL KEV | Dec 9, 2025 | Dec 30, 2025 | Not reported |
| ENISA EUVD | Dec 9, 2025 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected Products
24 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Windows 10 1809Microsoft | See advisory | 10.0.17763.8146 |
| Windows 10 21h2Microsoft | See advisory | 10.0.19044.6691 |
| Windows 10 22h2Microsoft | See advisory | 10.0.19045.6691 |
| Windows 11 23h2Microsoft | See advisory | 10.0.22631.6345 |
| Windows 11 24h2Microsoft | See advisory | 10.0.26100.7392 |
Patched Releases
Windows 10 1809
10.0.17763.8146
Windows 10 21h2
10.0.19044.6691
Windows 10 22h2
10.0.19045.6691
Windows 11 23h2
10.0.22631.6345
Windows 11 24h2
10.0.26100.7392
Windows 11 25h2
10.0.26200.7392
Windows Server 2019
10.0.17763.8146
Windows Server 2022
10.0.20348.4467, 10.0.20348.4529
Windows Server 2022 23h2
10.0.25398.2025
Windows Server 2025
10.0.26100.7392, 10.0.26100.7462
Windows 10 Version 1809
10.0.17763.8146
Windows 10 Version 21H2
10.0.19044.6691
Windows 10 Version 22H2
10.0.19045.6691
Windows 11 version 22H3
10.0.22631.6345
Windows 11 Version 23H2
10.0.22631.6345
Windows 11 Version 24H2
10.0.26100.7462
Windows 11 Version 25H2
10.0.26200.7462
Windows Server 2019 (Server Core installation)
10.0.17763.8146
Windows Server 2022, 23H2 Edition (Server Core installation)
10.0.25398.2025
Windows Server 2025 (Server Core installation)
10.0.26100.7462
Timeline
Publicly disclosed
Dec 8, 2025
Added to CISA KEV
Dec 9, 2025
Added to Industry KEV feed
Dec 9, 2025
Added to CIRCL KEV
Dec 9, 2025
Added to ENISA EUVD
Dec 9, 2025
Last updated
Sep 25, 2026
Weakness Type
- CWE-416 Use After Free
References
- advisoryWindows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
Use after free in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.
Affected: Windows 10 1809 (Microsoft); Windows 10 21h2 (Microsoft); Windows 10 22h2 (Microsoft), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Dec 9, 2025.
Yes. It was added on Dec 9, 2025 with a federal remediation due date of Dec 30, 2025.
Public exploit code is available.
Fixed versions are available, including Windows 10 1809 10.0.17763.8146, Windows 10 21h2 10.0.19044.6691, Windows 10 22h2 10.0.19045.6691.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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