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Vulnerabilities

Vulnerability · CVE-2025-62221

Microsoft Windows Use After Free Vulnerability

Published Dec 9, 2025 · catalog updated Sep 25, 2026 · Microsoft Windows

Patch now

CVE-2025-62221 is in the CISA known-exploited catalog, due Dec 30, 2025. Confirm Microsoft Windows against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
High7.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
2.50%
Remediation
Remediation guidance
Affected products
cpe microsoft/windows 10 1809 · cpe microsoft/windows 10 21h2 · cpe microsoft/windows 10 22h2 · cpe microsoft/windows 11 23h2 · cpe microsoft/windows 11 24h2 · cpe microsoft/windows 11 25h2

Microsoft Windows Cloud Files Mini Filter Driver contains a use after free vulnerability that can allow an authorized attacker to elevate privileges locally.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/windows 10 1809version unspecified
  • cpe microsoft/windows 10 21h2version unspecified
  • cpe microsoft/windows 10 22h2version unspecified
  • cpe microsoft/windows 11 23h2version unspecified
  • cpe microsoft/windows 11 24h2version unspecified
  • cpe microsoft/windows 11 25h2version unspecified
  • cpe microsoft/windows server 2019version unspecified
  • vendor Microsoft Windowsversion unspecified

How to fix CVE-2025-62221

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-62221 is in the CISA known-exploited catalog, due Dec 30, 2025. Confirm Microsoft Windows against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

What should an analyst verify?

CWE-416: Use After Free. EPSS 2.50%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Windows security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 9, 2025 · Catalog

    Detected

    Microsoft Windows Cloud Files Mini Filter Driver contains a use after free vulnerability that can allow an authorized attacker to elevate privileges locally.

  2. Dec 9, 2025 · CISA KEV

    Known exploited

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  3. Dec 30, 2025 · CISA KEV

    Remediation due

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  4. Sep 25, 2026 · Catalog

    Updated

    Microsoft Windows Cloud Files Mini Filter Driver contains a use after free vulnerability that can allow an authorized attacker to elevate privileges locally.

Sources

  • CISA KEVConfirmed exploitationCVE-2025-62221

    Microsoft Windows Cloud Files Mini Filter Driver contains a use after free vulnerability that can allow an authorized attacker to elevate privileges locally.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2025-62221

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-62221

    30-day exploitation probability 2.5%

    first.org
  • NIST NVDVulnerability recordCVE-2025-62221

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

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2025-62221

    Microsoft Windows Cloud Files Mini Filter Driver contains a use after free vulnerability that can allow an authorized attacker to elevate privileges locally.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.