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CVE-2021-40449: Microsoft Windows Win32k Privilege Escalation Vulnerability
Microsoft Windows · in CISA KEV since 2021-11-17
2021-11-17added to KEV
2021-12-01federal remediation due date
74.13%EPSS exploit probability (30 days) 99.5th percentile
7.8 HIGHCVSS 3.1
Knownknown ransomware use
35days from NVD publication to KEV
What it is
Unspecified vulnerability allows for an authenticated user to escalate privileges.
Required action (CISA)
Apply updates per vendor instructions.
| CWE | CWE-416 |
|---|---|
| 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-2021-40449.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.