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CVE-2021-40450: Microsoft Win32k Privilege Escalation Vulnerability
Microsoft Win32k · in CISA KEV since 2022-04-25
2022-04-25added to KEV
2022-05-16federal remediation due date
2.08%EPSS exploit probability (30 days) 80.7th percentile
7.8 HIGHCVSS 3.1
Unknownknown ransomware use
194days from NVD publication to KEV
What it is
Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation.
Required action (CISA)
Apply updates per vendor instructions.
| CWE | — |
|---|---|
| CVSS vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD published | 2021-10-13 (Analyzed) |
Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2021-40450.json · all KEV CVEs
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Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.
Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.