KLA12257
Multiple vulnerabilities in Microsoft Developer Tools

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

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. An information disclosure vulnerability in ASP.NET Core and Visual Studio can be exploited remotely to obtain sensitive information.
3. A denial of service vulnerability in .NET Core and Visual Studio can be exploited remotely to cause denial of service.

.NET 5.0
.NET Core 2.1
.NET Core 3.1

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

CVE-2021-34485
CVE-2021-34532
CVE-2021-26423