One of the major security enhancements in the latest Release 20.3.1 - Build 9228 was secure loading of libraries.
In order to protect from DLL preloading attacks, Campaign now loads Windows DLLs only from the Windows default system DLL path while loading the Campaign Client (nlclient).
To learn more in detail about this, check out this document: Secure loading of libraries to prevent DLL preloading attacks
In case you have any questions, please feel free to post them below or reach out through the community Q and A section. In case you have any ideas and/or suggestions regarding the Campaign Classic product, then kindly submit them here.