Actively exploited · Published Oct 13, 2021 · Assigned by microsoft
CVE-2021-40450Win32k Elevation of Privilege Vulnerability
High 7.8 Exploited
In plain English
A high-severity security flaw in Windows 10 Version 1809 from Microsoft. Attackers are actively exploiting it in the wild (listed by CISA on April 25, 2022). The chance it is exploited in the next 30 days is estimated at 1.6% (higher than 76% of all known vulnerabilities). Apply updates per vendor instructions.
Severity (CVSS 3.1)7.8High
Exploit odds (30 days)1.6%top 24.3% of all CVEs
Exploited in the wildYesCISA KEV since Apr 25, 2022
Attack toolingNoneno public tooling known
CISA guidance
Apply updates per vendor instructions.
Federal agencies must remediate by May 16, 2022.
Official description
Win32k Elevation of Privilege Vulnerability
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 Version 1809 | 10.0.0 – before 10.0.17763.2237 |
| Microsoft | Windows Server 2019 | 10.0.0 – before 10.0.17763.2237 |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.0 – before 10.0.17763.2237 |
| Microsoft | Windows 10 Version 1909 | 10.0.0 – before 10.0.18363.1854 |
| Microsoft | Windows 10 Version 21H1 | 10.0.0 – before 10.0.19043.1288 |
| Microsoft | Windows Server 2022 | 10.0.0 – before 10.0.20348.288 |
| Microsoft | Windows 10 Version 2004 | 10.0.0 – before 10.0.19041.1288 |
| Microsoft | Windows Server version 2004 | 10.0.0 – before 10.0.19041.1288 |
| Microsoft | Windows 10 Version 20H2 | 10.0.0 – before 10.0.19042.1288 |
| Microsoft | Windows Server version 20H2 | 10.0.0 – before 10.0.19042.1288 |
| Microsoft | Windows 11 version 21H2 | 10.0.0 – before 10.0.22000.258 |