Actively exploited · Published Jul 14, 2021 · Assigned by microsoft
CVE-2021-33771Windows Kernel Elevation of Privilege Vulnerability
High 7.8 Exploited
In plain English
A high-severity security flaw in Windows 10 Version 1507 from Microsoft. Attackers are actively exploiting it in the wild (listed by CISA on November 3, 2021). The chance it is exploited in the next 30 days is estimated at 10.2% (higher than 96% of all known vulnerabilities). Apply updates per vendor instructions.
Severity (CVSS 3.1)7.8High
Exploit odds (30 days)10.2%top 4.3% of all CVEs
Exploited in the wildYesCISA KEV since Nov 3, 2021
Attack toolingNoneno public tooling known
CISA guidance
Apply updates per vendor instructions.
Federal agencies must remediate by Nov 17, 2021.
Official description
Windows Kernel Elevation of Privilege Vulnerability
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 Version 1507 | 10.0.10240.0 – before 10.0.10240.19003 |
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0 – before 10.0.14393.4530 |
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 – before 10.0.17763.2061 |
| Microsoft | Windows 10 Version 1809 | 10.0.0 – before 10.0.17763.2061 |
| Microsoft | Windows 10 Version 1909 | 10.0.0 – before 10.0.18363.1679 |
| Microsoft | Windows 10 Version 2004 | 10.0.0 – before 10.0.19041.1110 |
| Microsoft | Windows 10 Version 20H2 | 10.0.0 – before 10.0.19042.1110 |
| Microsoft | Windows 10 Version 21H1 | 10.0.0 – before 10.0.19043.1110 |
| Microsoft | Windows 8.1 | 6.3.0 – before 6.3.9600.20069 |
| Microsoft | Windows Server 2012 R2 | 6.3.9600.0 – before 6.3.9600.20069 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.9600.0 – before 6.3.9600.20069 |
| Microsoft | Windows Server 2016 | 10.0.14393.0 – before 10.0.14393.4530 |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 – before 10.0.14393.4530 |
| Microsoft | Windows Server 2019 | 10.0.17763.0 – before 10.0.17763.2061 |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 – before 10.0.17763.2061 |
| Microsoft | Windows Server version 2004 | 10.0.0 – before 10.0.19041.1110 |
| Microsoft | Windows Server version 20H2 | 10.0.0 – before 10.0.19042.1110 |
References
- Windows Kernel Elevation of Privilege Vulnerability vendor-advisory, patch
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33771 x_refsource_MISC, x_transferred
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33771 government-resource