ESET NOD32 Antivirus before 1.1743 allows remote attackers to cause a denial of service (crash) via a crafted .CHM file that triggers a divide-by-zero error.
http://www.vupen.com/english/advisories/2006/5095
http://www.securityfocus.com/bid/21682
http://www.securityfocus.com/archive/1/454949/100/0/threaded
http://securityreason.com/securityalert/2079