Skulltag 0.97d2-RC2 and earlier allows remote attackers to cause a denial of service (daemon hang) via a series of long, malformed connect packets, related to these packets being "parsed multiple times."
https://exchange.xforce.ibmcloud.com/vulnerabilities/43125
http://www.securityfocus.com/bid/29760
http://www.securityfocus.com/archive/1/493386/100/0/threaded
http://skulltag.com/testing/public/Skulltag%20Version%20History.txt
http://securityreason.com/securityalert/3953