GridServer 6.3.1 Hotfix7 has been released. Here are the release notes:
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Introduction  
 
This hotfix is not cumulative.  
 
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Affected Components for 6.3.1_hotfix07
 
The following components are updated by this hotfix:
 
Tomcat
 
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Closed Issues in 6.3.1_hotfix07 (This Release)
 
Tomcat 
GS-18354  Apache Tomcat is upgraded to version 8.5.95.
 
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To download this hotfix, login to the Support Portal and navigate to Downloads > Hotfixes > AvailableDownloads > DataSynapse > GridServer > 6.3.1.