The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS: libtomcat8-java 8.0.32-1ubuntu1.11 tomcat8 8.0.32-1ubuntu1.11 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-4251-1
CVE-2019-12418, CVE-2019-17563
https://launchpad.net/ubuntu/+source/tomcat8/8.0.32-1ubuntu1.11
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