If you did a complete install of OM Web Viewer 12.1 including Tomcat 7.0.54, an upgrade to Apache Tomcat 8.5.4 is available now as RO91790 UPDATE APACHE TOMCAT TO 8.5.4. This is NOT a cumulative apar. Complete instructions are included with the download.
If you downloaded Apache Tomcat from another source, do not use this solution. You should obtain the Apache Tomcat update from that other source.