Senao SI-680H Wireless VoIP Phone Firmware 0.03.0839 leaves the VxWorks debugger UDP port 17185 available without authentication, which allows attackers to access the phone OS, obtain sensitive information, and cause a denial of service.
http://www.vupen.com/english/advisories/2005/2474
http://www.securityfocus.com/bid/15475
http://secunia.com/advisories/17606
http://lists.grok.org.uk/pipermail/full-disclosure/2005-November/038836.html