Actively exploited · Published Oct 13, 2021 · Assigned by microsoft
CVE-2021-40449Win32k Elevation of Privilege Vulnerability
High 7.8 Exploited Ransomware
In plain English
A high-severity use-after-free in Windows 10 Version 1507 from Microsoft. Attackers are actively exploiting it in the wild (listed by CISA on November 17, 2021). It has been used in ransomware campaigns. The chance it is exploited in the next 30 days is estimated at 81.9% (higher than 99.7% 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 Dec 1, 2021.
Official description
Win32k Elevation of Privilege Vulnerability
Affected products (as reported)
Weakness: CWE-416 · 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-2021-40449 x_refsource_MISC
- http://packetstormsecurity.com/files/164926/Win32k-NtGdiResetDC-Use-After-Free-Local-Privilege-Escalation.html x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40449 government-resource