BZFlag server 2.0.4 and earlier allows remote attackers to cause a denial of service (application crash) via a callsign that is not followed by a NULL (\0) character.
https://exchange.xforce.ibmcloud.com/vulnerabilities/23872
http://secunia.com/advisories/18238
http://cvs.sourceforge.net/viewcvs.py/%2Acheckout%2A/bzflag/bzflag/ChangeLog?rev=2.103