WINDOWS 10 KB4493509

Windows 10 KB4493509 applies to version 1809. This is a cumulative update that addresses a large number of CVE problems. THis changes the build number to 17763.437.

We notice a slight improvement in performance suggesting more improvements in the code base are present. We also noticed many reports that GSOD faults have been fixed with some games.

  • Addresses an issue that occurs when you enable per font end-user-defined characters (EUDC). The system will stop working and a blue screen will appear at startup. This is not a common setting in non-Asian regions.
  • Addresses an issue that may cause applications that use MSXML6 to stop responding if an exception was thrown during node operations.
  • Addresses an issue that causes the Group Policy editor to stop responding when editing a Group Policy Object (GPO) that contains Group Policy Preferences (GPP) for Internet Explorer 10 Internet settings.
  • Addresses an issue that may cause authentication issues for Internet Explorer 11 and other applications that use WININET.DLL. This occurs when two or more people use the same user account for multiple, concurrent login sessions on the same Windows Server machine, including Remote Desktop Protocol (RDP) and Terminal Server logons.
  • Security updates to Windows Datacenter Networking, Windows Server, the Microsoft JET Database Engine, Windows Kernel, Windows Input and Composition, Microsoft Scripting Engine, Windows App Platform and Frameworks, Windows Storage and Filesystems, Microsoft Graphics Component, Windows Virtualization, Windows MSXML, Windows SQL components, and Microsoft Edge.

MSXML is a legacy component that was last included with Visual Studio 2005. It is also used by Office 2003 and Office 2007. Office 2010 and above do not use MSXML.


Some Windows 7 and 8.1 users reported issues with Avast and Sophos security packages. Windows 10 users were not affected.

Some other security programs have been reported as freezing Windows 10 in operation and at bootup. Arcabit has been reported but others are also suspected.