The FiWin SS28S WiFi VoIP SIP/Skype Phone, firmware version 01_02_07, has a hard-coded username and password, which allows remote attackers to gain administrative access via telnet.
https://exchange.xforce.ibmcloud.com/vulnerabilities/29114
http://www.securityfocus.com/bid/20154
http://www.osnews.com/story.php/15923/Review-FiWin-SS28S-WiFi-VoIP-SIPSkype-Phone/
http://secunia.com/advisories/22041
http://archives.neohapsis.com/archives/fulldisclosure/2006-09/0391.html