CVE-2021-40450
Win32k Elevation of Privilege Vulnerability
Win32k Elevation of Privilege Vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Win32k Elevation of Privilege Vulnerability
Win32k Elevation of Privilege Vulnerability
- Record
CVE-2021-40450- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
EUVDEUVD-2021-27627
Win32k Elevation of Privilege Vulnerability
- Record
EUVD-2021-27627- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-v7qc-rhmv-f6j4
Win32k Elevation of Privilege Vulnerability This CVE ID is unique from CVE-2021-40449, CVE-2021...
Win32k Elevation of Privilege Vulnerability This CVE ID is unique from CVE-2021-40449, CVE-2021-41357.
- Record
GHSA-v7qc-rhmv-f6j4- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-269
- Updated
- 2026-11-02
CISA KEV No score
Microsoft Win32k Privilege Escalation Vulnerability
Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation.
- Record
CVE-2021-40450- Updated
- 2026-11-02
NVD
Win32k Elevation of Privilege Vulnerability
- Record
CVE-2021-40450- CVSS 3.1
- 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
- 4.6 Medium
AV:L/AC:L/Au:N/C:P/I:P/A:P - Updated
- 2026-11-02
Affected products
- microsoft win32k
- microsoft windows 10 version 1809
- microsoft windows 10 version 1909
- microsoft windows 10 version 2004
- microsoft windows 10 version 20h2
- microsoft windows 10 version 21h1
- microsoft windows 11 version 21h2
- microsoft windows server 2019
- microsoft windows server 2019 (server core installation)
- microsoft windows server 2022
- microsoft windows server version 2004
- microsoft windows server version 20h2
History
| Recorded | Changed | Sources |
|---|---|---|
| exploitation | ||
| first indexed | CVE List, EUVD, GitHub Advisories, CISA KEV, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-40450 is a high vulnerability (CVSS 7.8) in Microsoft Win32k, published October 13, 2021. CISA lists it as known to be exploited, since April 25, 2022. EUVD reports exploitation since April 25, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.58%, the 75th percentile. No source names a fixed version.