Microsoft Windows Use After Free Vulnerability (CVE-2025-62221)
Severity: high · Patch status: unknown · Since 2025-12-09 · CVE-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 added CVE-2025-62221 to its Known Exploited Vulnerabilities catalog on Dec 9, 2025, which means attackers are exploiting it in the wild.
What to do
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- US federal agencies must remediate by Dec 30, 2025 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch