How severe is CVE-2025-62221?

CVE-2025-62221 has a CVSS 3.1 base score of 7.8 (HIGH). EPSS estimates a 2.5% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2025-62221: Windows Cloud Files Mini Filter Driver Elevation of

CISA Known Exploited Vulnerabilities

Microsoft Windows Use After Free Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2025-12-09

Remediation due

2025-12-30

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.

CISA notes
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-62221 ; https://nvd.nist.gov/vuln/detail/CVE-2025-62221

Description

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

Severity

CVSS 3.1 · CNA7.8 HIGH

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

SSVC · CISA-ADP

Exploitationactive

Automatableno

Technical impacttotal

Affected Products

Vendor	Product	Affected versions
Microsoft	Windows 10 Version 1809	10.0.17763.0 to <10.0.17763.8146
Microsoft	Windows 10 Version 21H2	10.0.19044.0 to <10.0.19044.6691
Microsoft	Windows 10 Version 22H2	10.0.19045.0 to <10.0.19045.6691
Microsoft	Windows 11 version 22H3	10.0.22631.0 to <10.0.22631.6345
Microsoft	Windows 11 Version 23H2	10.0.22631.0 to <10.0.22631.6345
Microsoft	Windows 11 Version 24H2	10.0.26100.0 to <10.0.26100.7462
Microsoft	Windows 11 Version 25H2	10.0.26200.0 to <10.0.26200.7462
Microsoft	Windows Server 2019	10.0.17763.0 to <10.0.17763.8146
Microsoft	Windows Server 2019 (Server Core installation)	10.0.17763.0 to <10.0.17763.8146
Microsoft	Windows Server 2022	10.0.20348.0 to <10.0.20348.4529
Microsoft	Windows Server 2022, 23H2 Edition (Server Core installation)	10.0.25398.0 to <10.0.25398.2025
Microsoft	Windows Server 2025	10.0.26100.0 to <10.0.26100.7462
Microsoft	Windows Server 2025 (Server Core installation)	10.0.26100.0 to <10.0.26100.7462

References

1 Links

Vendor advisories

Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability

Record Details

Published

2025-12-09

Last updated

2026-04-16

Assigner (CNA)

microsoft

Credited to

More from Microsoft

CVE-2019-07089.8

Microsoft Remote Desktop Services Remote Code Execution Vulnerability

CVE-2021-344739.1

Microsoft Exchange Server Remote Code Execution Vulnerability

CVE-2025-537709.8

Microsoft SharePoint Server Remote Code Execution Vulnerability

CVE-2021-268559.1

Microsoft Exchange Server Remote Code Execution Vulnerability

Related Tool Categories

Tool categories that test for or protect against this vulnerability class.

CWE-416 · Use After Free

Fuzzing Binary Exploitation

CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.