The current public security baseline shows 7u65 is the secure version for 7ux
https://javadl-esd-secure.oracle.com/update/baseline.version

but user can not request to install jre 7u65 via DT deployJava.installJRE('1.7.0_65")
The request is silently ignored / no-ops

The reason is probably that the dtoolkit.xml (http://java.com/inc/dtoolkit.xml) currently lists 7u67 as the security baseline (not 7u65), so the request to install deployJava.installJRE('1.7.0_65") does not go through