The default configuration of the POP server in TCP/IP Services 5.6 for HP OpenVMS 8.3 generates different responses depending on whether or not a username is valid, which allows remote attackers to enumerate valid POP usernames.Referenceshttp://osvdb.org/37809http://groups.google.com/group/comp.os.vms/browse_thread/thread/a5f68773805f862d/8a42e91fe1e9cd36http://secunia.com/advisories/25882http://www.securityfocus.com/bid/24751https://exchange.xforce.ibmcloud.com/vulnerabilities/35255
