CVE-2021-40450Actively exploitedAdded to KEV 2022-04-25

Microsoft Win32k Privilege Escalation Vulnerability

Microsoft, Win32k

Description

Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation.

CVSS severity for this advisory hasn't been enriched from NVD yet, check back shortly.

EPSS, exploit probability

Medium

1.6%

estimated chance of real-world exploitation in the next 30 days, higher than 75.4% of every CVE FIRST.org scores

Refreshed 10/28/2026, via FIRST.org's EPSS model, not CVSS, this measures likelihood of exploitation, not how severe it would be.

Required action

Apply updates per vendor instructions.

CISA-recommended due date: 2022-05-16

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