CVEvulnerability

CVE-2021-40449

7.8 HIGH Known exploited Published 2021-10-13 Modified 2026-06-17 Official page ↗

CISA Known Exploited Vulnerability

Microsoft Windows Win32k Privilege Escalation Vulnerability — Microsoft Windows

Unspecified vulnerability allows for an authenticated user to escalate privileges.

Added to KEV
2021-11-17
Remediation due
2021-12-01
Ransomware use
Known
Required action
Apply updates per vendor instructions.
Notes
https://nvd.nist.gov/vuln/detail/CVE-2021-40449
Status
Analyzed
Published
2021-10-13
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.8 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1 ([email protected])
7.8 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected])
4.6 MEDIUM — AV:L/AC:L/Au:N/C:P/I:P/A:P
Weaknesses
CWE-416

Description

Win32k Elevation of Privilege Vulnerability

Affected configurations

• microsoft windows 10 1507 (< 10.0.10240.19086) • microsoft windows 10 1607 (< 10.0.14393.4704) • microsoft windows 10 1809 (< 10.0.17763.2237) • microsoft windows 10 1909 (< 10.0.18363.1854) • microsoft windows 10 2004 (< 10.0.19041.1288) • microsoft windows 10 20h2 (< 10.0.19041.1288) • microsoft windows 10 21h1 (< 10.0.19041.1288) • microsoft windows 11 • microsoft windows 11 21h2 (< 10.0.22000.258) • microsoft windows 7 • microsoft windows 8.1 • microsoft windows rt 8.1 • microsoft windows server 2004 (< 10.0.19041.1288) • microsoft windows server 2008 • microsoft windows server 2008 r2 • microsoft windows server 2012 • microsoft windows server 2012 r2 • microsoft windows server 2016 (< 10.0.14393.4704) • microsoft windows server 2019 (< 10.0.17763.2237) • microsoft windows server 2022 (< 10.0.20348.288) • microsoft windows server 20h2 (< 10.0.19042.1288)

Related

Weakness · CWE (1)

References