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.
https://www.exploit-db.com/exploits/6237
https://exchange.xforce.ibmcloud.com/vulnerabilities/44428
http://www.vupen.com/english/advisories/2008/2365
http://www.securityfocus.com/archive/1/495448/100/0/threaded
http://securityreason.com/securityalert/4156
http://security.gentoo.org/glsa/glsa-200904-13.xml
http://secunia.com/advisories/34696