Microsoft has released May 2021 security updates for Windows 10/8/7, Windows Server 2016/2012/2008, and Microsoft Exchange Server 2019/2016/2013.
These updates include 55 security fixes. Users should update as soon as possible to avoid potential exploitation.
System administrators should update servers as soon as possible to avoid potential exploitation.
How to update Windows
May 2021 Security Updates (Release Notes)