Release Date: April 11, 2017

The April security release consists of security updates for the following software:
  • Internet Explorer
  • Microsoft Edge
  • Microsoft Windows
  • Microsoft Office and Microsoft Office Services and Web Apps
  • Visual Studio for Mac
  • .NET Framework
  • Silverlight
  • Adobe Flash Player

Please note the following information regarding the security updates:
  • Beginning with the October 2016 release, Microsoft is changing the update servicing model for Windows 7, Windows Server 2008 R2, Windows 8.1, Windows Server 2012, and Windows Server 2012 R2. For more information, please see this Microsoft Technet article, Further simplifying servicing models forWindows 7 and Windows 8.1.
  • Windows 10 updates are cumulative. The monthly security release includes all security fixes for vulnerabilities that affect Windows 10, in addition to non-security updates. The updates are available via the Microsoft Update Catalog.
  • Starting in March 2017, there will be a Windows 10 1607 delta package that contains just the delta changes between the previous month and the current release.
  • Updates for Windows RT 8.1 and Microsoft Office RT software are only available via Windows Update.
  • In addition to security changes for the vulnerabilities, updates include defense-in-depth updates to help improve security-related features

Note As a reminder, the Security Updates Guide will be replacing security bulletins. Please see our blog post, Furthering our commitment to security updates, for more details.

Known Issues

4015549
4015546
4015550
4015547

Source: April 2017 Security Updates - Microsoft Security TechCentet