ZyXel P2000W VoIP 802.11b Wireless Phone running firmware WV.00.02 allows remote attackers to obtain sensitive information, such as MAC address and software version, by directly accessing UDP port 9090.
https://exchange.xforce.ibmcloud.com/vulnerabilities/24145
http://www.securityfocus.com/bid/16285
http://secunia.com/advisories/18511
http://lists.grok.org.uk/pipermail/full-disclosure/2006-January/041438.html