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CISA KEV · Known exploitedHigh

CVE-2025-62221

Microsoft Windows

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

CVSS
7.8
EPSS
2.38%
82.2% percentile
CISA KEV
Listed
Published
2025.12.10
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability2.38%
Technical severityCVSS 7.8

Vulnerability overview

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

Affected product and versions

Product
Microsoft Windows
Affected versions
10.0.17763.0, 10.0.19044.0, 10.0.19045.0, 10.0.22631.0, 10.0.26100.0, 10.0.26200.0, 10.0.20348.0, 10.0.25398.0, < 10.0.17763.8146, < 10.0.19044.6691, < 10.0.19045.6691, < 10.0.22631.6345, < 10.0.26100.7392, < 10.0.26200.7392, < 10.0.20348.4467, < 10.0.25398.2025
Fixed versions
10.0.17763.8146, 10.0.19044.6691, 10.0.19045.6691, 10.0.22631.6345, 10.0.26100.7392, 10.0.26200.7392, 10.0.20348.4467, 10.0.25398.2025

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA 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.

Due date: 2025.12.30
  1. 1
    Identify

    Confirm that Microsoft Windows and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416
KEV added
2025.12.09
Ransomware use
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