Mishandling of a developer-supplied key was found in Microsoft .NET 4.6.2 Framework’s Data Provider for SQL Server. By exploiting this vulnerability malicious users can obtain sensitive cleartext information. This vulnerability can be exploited remotely via leveraging key guessability.
Microsoft .NET Framework 4.6.2
Install necessary updates from the KB section, that are listed in your Windows Update (Windows Update usually can be accessed from the Control Panel)