Buffer overflow in SIPfoundry sipXtapi released before 20060324 allows remote attackers to execute arbitrary code via a long CSeq field value in an INVITE message.
https://exchange.xforce.ibmcloud.com/vulnerabilities/27681
http://www.vupen.com/english/advisories/2006/2735
http://www.securityfocus.com/archive/1/440135/100/0/threaded
http://www.securityfocus.com/archive/1/439617/100/0/threaded
http://securitytracker.com/id?1016455
http://secunia.com/advisories/20997
http://lists.grok.org.uk/pipermail/full-disclosure/2006-July/047794.html
http://lists.grok.org.uk/pipermail/full-disclosure/2006-July/047757.html