Format string vulnerability in the Cl_GetPackets function in cl_main.c in the client in Doomsday (aka deng) 1.9.0-beta5.1 and earlier allows remote Doomsday servers to execute arbitrary code via format string specifiers in a PSV_CONSOLE_TEXT message.
https://exchange.xforce.ibmcloud.com/vulnerabilities/36337
http://www.securityfocus.com/archive/1/478077/100/0/threaded
http://securityreason.com/securityalert/3084
http://security.gentoo.org/glsa/glsa-200802-02.xml
http://secunia.com/advisories/28821