KLA12311
Multiple vulnerabilities in Microsoft Developer Tools

Multiple vulnerabilities were found in Microsoft Developer Tools. Malicious users can exploit these vulnerabilities to execute arbitrary code, cause denial of service, obtain sensitive information.

Below is a complete list of vulnerabilities:

1. An information disclosure vulnerability in .NET Core and Visual Studio can be exploited remotely to obtain sensitive information.
2. A NULL pointer dereference in Microsoft Visual Studio can be exploited remotely to cause denial of service.
3. A NULL pointer dereference in signature algorithms processing can be exploited remotely to cause denial of service.
4. A CA certificate check bypass in Microsoft Visual Studio can be exploited remotely to obtain sensitive information.

Malware exists for this vulnerability. Usually such malware is classified as Exploit. More details.

Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)
Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10)
Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)
Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8)
Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6)
.NET 5.0

Install necessary updates from the KB section, that are listed in your Windows Update (Windows Update usually can be accessed from the Control Panel)