Agnitum Outpost Pro Firewall 2.1 allows remote attackers to cause a denial of service (CPU consumption) via a flood of small, invalid packets, which can not be processed quickly enough by Outpost Pro.
https://exchange.xforce.ibmcloud.com/vulnerabilities/16133
http://www.securityfocus.com/bid/10338
http://www.securiteam.com/windowsntfocus/5FP0E0KCUW.html