CVE-2021-40449
Microsoft Windows Win32k Privilege Escalation Vulnerability
Microsoft · Windows
Vulnerability details
Unspecified vulnerability allows for an authenticated user to escalate privileges.
Added to CISA KEV: 2021-11-17
Ransomware campaign use: Known
CISA due date: 2021-12-01
Defensive guidance from CISA
Apply updates per vendor instructions.
This is the source's required-action field, not an independently validated patch procedure. Refer to the vendor for exact affected versions and fixes.
Source catalog date: 2026-11-06T19:44:45.1797Z · Last retrieved: 2026-11-06 21:02:26 UTC