VulnerabilityAnalyzed

CVE-2025-62221

Microsoft Windows Use After Free Vulnerability

KEVHIGH 7.8EPSS 2.50%

Does this matter?

Known to be exploited in the wild (CISA KEV, CISA remediation deadline 30 December 2025). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.

Description

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

CVSS 3.1: 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 2.50% probability · 84th percentile
CISA KEV: Listed 9 December 2025 · due 30 December 2025
Weakness: CWE-416
Affected: microsoft/windows 10 1809 · microsoft/windows 10 21h2 · microsoft/windows 10 22h2 · microsoft/windows 11 23h2 · microsoft/windows 11 24h2 · microsoft/windows 11 25h2 · microsoft/windows server 2019 · microsoft/windows server 2022 · microsoft/windows server 2022 23h2 · microsoft/windows server 2025
Source: secure@microsoft.com

CISA notes

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-62221 ; https://nvd.nist.gov/vuln/detail/CVE-2025-62221

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62221Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-62221US Government Resource

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.