CVE-2021-33739
Published: November 3, 2021
Official Description
Microsoft Desktop Window Manager (DWM) Core Library contains an unspecified vulnerability that allows for privilege escalation.
CISA KEV Advisory
Microsoft Desktop Window Manager (DWM) Core Library Privilege Escalation Vulnerability
Microsoft Desktop Window Manager (DWM) Core Library contains an unspecified vulnerability that allows for privilege escalation.
Apply updates per vendor instructions.
Risk Analysis
Microsoft Desktop Window Manager (DWM) Core Library contains an unspecified vulnerability that allows for privilege escalation. This high-severity flaw has an EPSS score of 0.19488, indicating a considerable likelihood of exploitation, and CISA has confirmed its active exploitation.
This vulnerability is actively exploited in the wild and is included in CISA's KEV catalog, confirming its use for privilege escalation.
Install the latest security updates for Microsoft Windows to patch the DWM Core Library privilege escalation vulnerability. Implement the principle of least privilege for all user accounts.
Technical Analysis
CVE-2021-33739 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-2021-33739 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.
Affected Vendors & Products
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-33739 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