CVE-2021-40449 HIGH

CVE-2021-40449: Win32k Elevation of Privilege Vulnerability

Vendor Microsoft
Product Windows 10 Version 1809
KEV Status Known Exploited
Ransomware Used in campaigns
Published October 13, 2021
Last update October 21, 2025
View on NVD All CVEs

CVSS base score

7.8/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

What the vulnerability does

01Description

Win32k Elevation of Privilege Vulnerability

CISA mandated remediation

02CISA Required Action

Apply updates per vendor instructions.

Key dates

03Disclosure timeline

October 13, 2021 CVE published
October 21, 2025 Record updated