Stack-based buffer overflow in the logging function in the Unreal engine, possibly 2003 and 2004, as used in the internal web server, allows remote attackers to cause a denial of service (application crash) via a request for a long .gif filename in the images/ directory, related to conversion from Unicode to ASCII.
https://exchange.xforce.ibmcloud.com/vulnerabilities/36102
http://www.securityfocus.com/bid/25374
http://www.securityfocus.com/archive/1/477026/100/0/threaded
http://securityreason.com/securityalert/3039
http://secunia.com/advisories/26506