Are Trados GroupShare and MultiTerm Online affected by the CVE-2021-44228 log4j vulnerability?
No. Trados GroupShare and MultiTerm Online are not using the affected versions of log4j. They use log4j 1.2.13. The vulnerability impacts all log4j versions which are higher than or equal to 2.0-beta9 and lower than 2.15.
MultiTerm Online does not have JMSAppender configured. The logging configuration can be checked under the Apache Tomcat folder\webapps\multiterm\WEB-INF\classes\log4j.properties