The Core::Receive function in neonet/core.cpp for NeoEngine 0.8.2 and earlier, and CVS 3422, allow remote attackers to cause a denial of service (engine crash) via a message with a large uiMessageLength that produces a failed memory allocation and a null pointer dereference.
https://exchange.xforce.ibmcloud.com/vulnerabilities/27529
http://www.securityfocus.com/bid/18696