CVE-2021-28310
Published: November 3, 2021
Official Description
Microsoft Windows Win32k contains an unspecified vulnerability that allows for privilege escalation.
CISA KEV Advisory
Microsoft Win32k Privilege Escalation Vulnerability
Microsoft Windows Win32k contains an unspecified vulnerability that allows for privilege escalation.
Apply updates per vendor instructions.
Risk Analysis
This unspecified vulnerability in Microsoft Windows Win32k allows for privilege escalation, enabling an attacker to gain higher access on a compromised system. The high severity, confirmed in-the-wild exploitation, and an EPSS score of 0.27820 indicate a critical and actively exploited flaw that requires immediate attention.
This vulnerability is actively exploited in the wild and is listed in CISA's KEV catalog.
Apply the latest security updates for Microsoft Windows to address the Win32k privilege escalation vulnerability. Ensure all systems are regularly patched and follow least privilege principles for user accounts.
Technical Analysis
CVE-2021-28310 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-2021-28310 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-2021-28310 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