The EUCARIS Application itself does not use log4j and therefore is considered not to be affected by the known log4j related security vulnerabilities.

If you run Oracle databases for EUCARIS, than it is possible that log4j is used.
Please check the Oracle website for information on security patches/workarounds.

EUCARIS Operations also advices to check your own infrastructure.
Apache is is the supplier of log4j, but a lot of Java applications do use it for logging purposes which you might not be aware of.
If you have custom / own developped software, please consult your provider / developper.
A list of commercial products using log4j can be found here