The Log4J exploit may affect OPC UA projects if they incorporate Java.

It does not affect the .NETStandard codebase.

Users of the Prosys based products will need an update and can get information here: https://www.prosysopc.com/blog/#Security

The open source Java Stack is not vulnerable on its own but vendors building products on that code could introduce the exploit:
https://github.com/OPCFoundati.....issues/221