CVE-2021-1732 Microsoft Win32k Privilege Escalation
Attackers can exploit a memory corruption flaw in Windows Win32k to gain elevated privileges on affected systems.
- Exploited in the wild
- Since 3 Nov 2021
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-1732?
CVE-2021-1732 is a high-severity memory corruption vulnerability in Microsoft Windows 10 1809, published on 25 Feb 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Windows Win32k Elevation of Privilege Vulnerability
Weakness: CWE-787
Which versions are affected by CVE-2021-1732?
It affects 9 products.
Products include Microsoft Windows 10 1803, Microsoft Windows 10 1809, Microsoft Windows 10 1909, Microsoft Windows 10 2004, Microsoft Windows 10 20h2, Microsoft Windows Server 1909 and 3 more.
How do I fix CVE-2021-1732?
No fix has been published for CVE-2021-1732 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 17 Nov 2021.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-1732 being exploited?
Yes. Attackers have exploited CVE-2021-1732 in the wild since at least 3 Nov 2021, including in ransomware campaigns.
Public exploit code: 1 Metasploit module and 13 proofs of concept on GitHub.
Other vulnerabilities in Microsoft Windows 10 1809
Sources
Also known as GHSA-gvwr-5hrc-2gr5.