This Metasploit module takes advantage a Java JMX interface insecure configuration, which would allow loading classes from any remote (HTTP) URL. JMX interfaces with authentication disabled (com.sun.management.jmxremote.authenticate=false) should be vulnerable, while interfaces with authentication enabled will be vulnerable only if a weak configuration is deployed (allowing to use javax.management.loading.MLet, having a security manager allowing to load a ClassLoader MBean, etc.).