CVE-2021-40450
Microsoft Win32k Privilege Escalation Vulnerability
Published Oct 12, 2021 · updated Jun 16, 2026 · microsoft windows 10 1809
Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Oct 12, 2021 · Catalog
Detected
Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation.
Apr 25, 2022 · CISA KEV
Known exploited
Apply updates per vendor instructions.
May 16, 2022 · CISA KEV
Remediation due
Apply updates per vendor instructions.
Jun 16, 2026 · Catalog
Updated
Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation.
Required action
Apply updates per vendor instructions.
CISA due date May 16, 2022
Affected
- cpe microsoft/windows 10 1809version unspecified
- cpe microsoft/windows 10 1909version unspecified
- cpe microsoft/windows 10 2004version unspecified
- cpe microsoft/windows 10 20h2version unspecified
- cpe microsoft/windows 10 21h1version unspecified
- cpe microsoft/windows 11 21h2version unspecified
- cpe microsoft/windows server 2004version unspecified
- cpe microsoft/windows server 2019version unspecified
- vendor Microsoft Win32kversion unspecified
Sources
- CISA KEVConfirmed exploitationCVE-2021-40450
Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation.
cisa.gov - CVE.orgVulnerability recordCVE-2021-40450
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2021-40450
30-day exploitation probability 1.6%
first.org - NIST NVDVulnerability recordCVE-2021-40450
Win32k Elevation of Privilege Vulnerability
nvd.nist.gov