As a part of their usual process of Patch Tuesday, Microsoft has released patches to mitigate security flaws in products such as Windows, Exchange Server, Internet Explorer, Office, Hyper-V, Visual Studio, and Skype for Business.
A new Windows network Remote Code Execution (RCE) zero-day exploit – CVE-2021-31166, has been in the news since Patch Tuesday. This vulnerability allows an unauthenticated attacker to remotely execute code as kernel. This is a wormable vulnerability where an attacker can send a malicious crafted packet to the target impacted web server. This critical vulnerability is rated 9.8/10 on the CVSS scale.
- Windows Server, version 20H2 (Server Core Installation)
- Windows 10 Version 20H2 for ARM64-based Systems
- Windows 10 Version 20H2 for 32-bit Systems
- Windows 10 Version 20H2 for x64-based Systems
- Windows Server, version 2004 (Server Core installation)
- Windows 10 Version 2004 for x64-based Systems
- Windows 10 Version 2004 for ARM64-based Systems
- Windows 10 Version 2004 for 32-bit Systems
Microsoft has released a separate advisory to address the vulnerability.
Qualys customers can scan their network with QID 91767 to detect vulnerable assets.
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References and Sources