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CVE-2025-62221

Microsoft Windows Use After Free

7.8 HIGHActively exploited (CISA KEV)EPSS 2.50%
  1. Published9 Dec 2025
  2. Added to CISA KEV9 Dec 2025
  3. Remediation due30 Dec 2025
Actively exploited (CISA KEV)

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

Added to KEV: 9 Dec 2025Federal remediation due: 30 Dec 2025

Description

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

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Microsoft Windows 10 1809< 10.0.17763.8146
Microsoft Windows 10 21h2< 10.0.19044.6691
Microsoft Windows 10 22h2< 10.0.19045.6691
Microsoft Windows 11 23h2< 10.0.22631.6345
Microsoft Windows 11 24h2< 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< 10.0.25398.2025
Microsoft Windows Server 2025< 10.0.26100.7392

Remediation

Fixed in
Microsoft Windows 10 1809≥ 10.0.17763.8146
Microsoft Windows 10 21h2≥ 10.0.19044.6691
Microsoft Windows 10 22h2≥ 10.0.19045.6691
Microsoft Windows 11 23h2≥ 10.0.22631.6345
Microsoft Windows 11 24h2≥ 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≥ 10.0.25398.2025
Microsoft Windows Server 2025≥ 10.0.26100.7392

References

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Frequently asked

Is CVE-2025-62221 being actively exploited?

Yes. CVE-2025-62221 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 9 Dec 2025.

How severe is CVE-2025-62221?

CVE-2025-62221 has a CVSS 3.1 base score of 7.8, rated high. EPSS estimates a 2.50% probability of exploitation.

Which products are affected by CVE-2025-62221?

Affected products include Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, and 5 more.

How do I fix CVE-2025-62221?

Upgrade affected software to a fixed version, for example Microsoft Windows 10 1809 10.0.17763.8146, Microsoft Windows 10 21h2 10.0.19044.6691, Microsoft Windows 10 22h2 10.0.19045.6691 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-62221 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.