CVE-2021-31955 Microsoft Windows Kernel Information Disclosure
An attacker can exploit a flaw in the Windows Kernel to disclose sensitive information, potentially aiding further attacks.
- 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-2021-31955?
CVE-2021-31955 is a medium-severity vulnerability in Microsoft Windows 10 1809, published on 8 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Windows Kernel Information Disclosure Vulnerability
Weakness: CWE-497
Which versions are affected by CVE-2021-31955?
It affects 8 products.
Products include Microsoft Windows 10 1809, Microsoft Windows 10 1909, Microsoft Windows 10 2004, Microsoft Windows 10 20h2, Microsoft Windows 10 21h1, Microsoft Windows Server 2004 and 2 more.
How do I fix CVE-2021-31955?
No fix has been published for CVE-2021-31955 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 17 Nov 2021.
Is CVE-2021-31955 being exploited?
Yes. Attackers have exploited CVE-2021-31955 in the wild since at least 3 Nov 2021.
Public exploit code: 2 proofs of concept on GitHub.
Other vulnerabilities in Microsoft Windows 10 1809
- CVE-2024-29988 Microsoft SmartScreen Prompt Security Feature Bypass
- CVE-2024-21412 Microsoft Windows Internet Shortcut Files Security Feature Bypass
- CVE-2025-62221 Microsoft Windows Use After Free
- CVE-2025-30400 Microsoft Windows DWM Core Library Use-After-Free
- CVE-2024-21338 Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control
Sources
Also known as GHSA-4grg-84cr-6c2h.