Based on the Apache Tomcat 9 document, Tomcat 9 supports TLS 1.3.
Endevor v19
If Tomcat 9 is used to install Endevor web services, then TLS 1.3 can be used as one of the sslEnabledProtocols to secure the connection to Endevor.
<Connector port="30308" maxHttpHeaderSize="8192"
maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
enableLookups="false" disableUploadTimeout="true"
SSLEnabled="true"
algorithm="IbmX509"
acceptCount="100" scheme="https" secure="true"
clientAuth="false" sslProtocol="TLS"
sslEnabledProtocols="TLSv1.2,TLSv1.1,TLSv1.3"
keystoreType="JCERACFKS"
keystoreFile="safkeyring://KEY_RING_OWNER/KEY_RING_NAME"
sslImplementationName="com.ca.sslsocket.CASSLImplementation" />
Common Service ENF is used to spawn Web Services spawn task (STC), apply SO12236 for CA common services v15.0, this PTF adds TLS 1.3 support to CAICCI.