Is CVE-2021-40450 actively exploited?

CVE-2021-40450 has no public evidence of in-the-wild exploitation as of 2025-10-30.

What is the CVSS score for CVE-2021-40450?

CVE-2021-40450 has a CVSS score of 7.8 (HIGH severity). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2021-40450?

Patch guidance is available from microsoft security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-40450.

Fix CVE-2021-40450 - HIGH microsoft windows 10 1809

Q: Which products are affected by CVE-2021-40450?

10 products: microsoft windows 10 1809, microsoft windows 10 1909, microsoft windows 10 2004, microsoft windows 10 20h2, microsoft windows 10 21h1, and 5 more.

Description

Win32k Elevation of Privilege Vulnerability

CVSS Metrics

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector: local
Complexity: low
Privileges: low
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: NVD-CWE-noinfo

Metadata

Primary Vendor: MICROSOFT
Published: 10/13/2021
Last Modified: 10/30/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

microsoft : windows_10_1809microsoft : windows_10_1909microsoft : windows_10_2004microsoft : windows_10_20h2microsoft : windows_10_21h1microsoft : windows_11_21h2microsoft : windows_server_2004microsoft : windows_server_2019microsoft : windows_server_2022microsoft : windows_server_20h2

Remediation Guidance

Executive Summary

View on NIST NVD