The fix for this update is included in the following cumulative updates and service pack for SQL Server:
Cumulative Update 4 for SQL Server 2016 Service Pack 1
Service pack information for SQL Server 2016
This update adds the CLR strict security feature to Microsoft SQL Server 2016.
However, the feature is turned off for backward compatibility in SQL Server 2016. Because of database level compatibility, the feature cannot be enabled by using the sp_configure 'clr strict security', 1 command.
To enable CLR strict security, add trace flag 6545 to the server Database Engine Service Startup Options. Remember that this trace flag can be used only together with SQL Server startup options. It cannot be set by using the
DBCC TRACEON command.