CVE-2021-31969
Published: April 11, 2026
Official Description
Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
Risk Analysis
This vulnerability affects the Windows Cloud Files Mini Filter Driver, allowing an attacker to elevate their privileges on an affected system. This is a critical flaw as it could grant an attacker higher access than intended. The presence of this CVE in CISA's KEV catalog indicates confirmed exploitation.
This vulnerability is actively being exploited in the wild, as confirmed by its inclusion in CISA's KEV catalog. Attackers are leveraging this flaw to gain elevated privileges.
Apply the latest security updates from Microsoft to patch the Windows Cloud Files Mini Filter Driver. Regular system patching is crucial to prevent privilege escalation attacks.
Technical Analysis
CVE-2021-31969 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2021-31969 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Exploit & PoC Resources
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-31969 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1