Actively exploited · Published Feb 25, 2021 · Assigned by microsoft
CVE-2021-1732Windows Win32k Elevation of Privilege Vulnerability
High 7.8 Exploited Ransomware
In plain English
A high-severity out-of-bounds write in Windows 10 Version 1803 from Microsoft. Attackers are actively exploiting it in the wild (listed by CISA on November 3, 2021). It has been used in ransomware campaigns. The chance it is exploited in the next 30 days is estimated at 78.4% (higher than 99.6% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit, public proof-of-concept code. Apply updates per vendor instructions.
CISA guidance
Apply updates per vendor instructions.
Federal agencies must remediate by Nov 17, 2021.
Official description
Windows Win32k Elevation of Privilege Vulnerability
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 Version 1803 | 10.0.0 – before publication |
| Microsoft | Windows 10 Version 1809 | 10.0.0 – before publication |
| Microsoft | Windows Server 2019 | 10.0.0 – before publication |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.0 – before publication |
| Microsoft | Windows 10 Version 1909 | 10.0.0 – before publication |
| Microsoft | Windows Server, version 1909 (Server Core installation) | 10.0.0 – before publication |
| Microsoft | Windows 10 Version 2004 | 10.0.0 – before publication |
| Microsoft | Windows Server version 2004 | 10.0.0 – before publication |
| Microsoft | Windows 10 Version 20H2 | 10.0.0 – before publication |
| Microsoft | Windows Server version 20H2 | 10.0.0 – before publication |
Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1732 x_refsource_MISC
- http://packetstormsecurity.com/files/161880/Win32k-ConsoleControl-Offset-Confusion.html x_refsource_MISC
- http://packetstormsecurity.com/files/166169/Win32k-ConsoleControl-Offset-Confusion-Privilege-Escalation.html x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1732 government-resource