Chicken of the VNC (cotv) 2.0 allows remote attackers to cause a denial of service (application crash) via a large computer-name size value in a ServerInit packet, which triggers a failed malloc and a resulting NULL dereference.
https://www.exploit-db.com/exploits/3257
https://exchange.xforce.ibmcloud.com/vulnerabilities/32166
http://www.securityfocus.com/archive/1/466966/100/0/threaded
http://www.securityfocus.com/archive/1/458907/100/0/threaded