A certain ActiveX control in RealNetworks RealPlayer 11 allows remote attackers to cause a denial of service (application crash) via a malformed .au file that triggers a divide-by-zero error. NOTE: this might be related to CVE-2007-4904.
https://www.exploit-db.com/exploits/4683
http://www.securityfocus.com/archive/1/484449/100/0/threaded