Microsoft Windows Use After Free Vulnerability

HIGH 7.8EXPLOITED (CISA KEV)CVE-2025-62221 · Published 09/12/2025 · updated 25/09/2026

Microsoft Windows Use After Free Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 09/12/2025. Patch affected systems as an emergency.

In short

CVE-2025-62221 is a HIGH (CVSS 7.8) vulnerability.
Exploited in the wild: CISA added it to the KEV catalog on 09/12/2025.
Chance of exploitation in the next 30 days (EPSS): 2.5%, higher than 84.7% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
Windows Microsoft	Versions not published yet (product named by CISA KEV)

Description

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

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62221 · Vendor Advisory
cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
CISA KEV · CVE-2025-62221

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