Microsoft has released security updates for multiple products to address vulnerabilities. A remote attacker can exploit some of these vulnerabilities to take control of an affected system. Microsoft has fixed 55 vulnerabilities, with four classified as Critical, 50 as Important, and one as Moderate. As part of May 2021 Patch Tuesday, Microsoft has also fixed three zero-day vulnerabilities:

CVE-2021-31204 - .NET and Visual Studio Elevation of Privilege Vulnerability;

CVE-2021-31207 - Microsoft Exchange Server Security Feature Bypass Vulnerability;

CVE-2021-31200 - Remote Code Execution Vulnerability.

More information on vulnerabilities and updates is available in the Microsoft's May 2021 Security Updates page – microsoft.com.

Source: bleepingcomputer.com