The client_cmd function in Empire 4.3.2 and earlier allows remote attackers to cause a denial of service (application crash) by causing long text strings to be appended to the player->client buffer, which causes an invalid memory access.
https://exchange.xforce.ibmcloud.com/vulnerabilities/26525
http://www.vupen.com/english/advisories/2006/1798
http://www.securityfocus.com/archive/1/433940/100/0/threaded
http://securityreason.com/securityalert/896
http://secunia.com/advisories/20094
http://empserver.cvs.sourceforge.net/empserver/empserver/src/lib/player/