The decryption function in Flagship Industries Ventrilo 3.0.2 and earlier allows remote attackers to cause a denial of service (NULL pointer dereference and server crash) by sending a type 0 packet with an invalid version followed by another packet to TCP port 3784.
aluigi.altervista.org/adv/ventrilobotomy-adv.txt
aluigi.org/poc/ventrilobotomy.zip
secunia.com/advisories/31466
secunia.com/advisories/34696
security.gentoo.org/glsa/glsa-200904-13.xml
securityreason.com/securityalert/4156
www.securityfocus.com/archive/1/495448/100/0/threaded
www.securityfocus.com/bid/30675
www.vupen.com/english/advisories/2008/2365
exchange.xforce.ibmcloud.com/vulnerabilities/44428
www.exploit-db.com/exploits/6237