Microsoft Win32k Privilege Escalation Vulnerability

HIGH 7.8EXPLOITED (CISA KEV)CVE-2021-40450 · Published 13/10/2021 · updated 17/06/2026

Microsoft Win32k Privilege Escalation Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 25/04/2022. Patch affected systems as an emergency.

Package	Affected versions	Patched versions
Win32k Microsoft	Versions not published yet (product named by CISA KEV)

Description

Win32k Elevation of Privilege Vulnerability

References

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40450 · Patch
cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
CISA KEV · CVE-2021-40450

Running one of these products? Scan your site to see whether it exposes a vulnerable version.

Scan my site free