The default installation of Cisco voice products, when running the IBM Director Agent on IBM servers before OS 2000.2.6, does not require authentication, which allows remote attackers to gain administrator privileges by connecting to TCP port 14247.
https://exchange.xforce.ibmcloud.com/vulnerabilities/14900
http://www.securitytracker.com/id?1008814
http://www.securityfocus.com/bid/9468
http://www.kb.cert.org/vuls/id/602734
http://www.cisco.com/warp/public/707/cisco-sa-20040121-voice.shtml