The telnet daemon in UTStarcom F1000 VOIP WIFI Phone s2.0 running VxWorks 5.5.1 with kernel WIND 2.6 has a default username "target" and password "password", which allows remote attackers to gain full access to the system.
http://www.vupen.com/english/advisories/2005/2472
http://www.securityfocus.com/bid/15476
http://secunia.com/advisories/17629
http://lists.grok.org.uk/pipermail/full-disclosure/2005-November/038834.html