Kerio WinRoute Firewall before 6.1.4 Patch 2 allows attackers to cause a denial of service (CPU consumption and hang) via unknown vectors involving "browsing the web".
https://exchange.xforce.ibmcloud.com/vulnerabilities/24317
http://www.vupen.com/english/advisories/2006/0324
http://www.securityfocus.com/bid/16385