Multiple buffer overflows in zabbix before 20061006 allow attackers to cause a denial of service (application crash) and possibly execute arbitrary code via long strings to the (1) zabbix_log and (2) zabbix_syslog functions.
http://www.vupen.com/english/advisories/2006/3959
http://www.securityfocus.com/bid/20416
http://secunia.com/advisories/22313
http://bugs.debian.org/cgi-bin/bugreport.cgi/zabbix.security.patch?bug=391388%3Bmsg=5%3Batt=1