Cisco devices running Application and Content Networking System (ACNS) 5.0, 5.1 before 5.1.13.7, or 5.2 before 5.2.3.9 allow remote attackers to cause a denial of service (bandwidth consumption) via "crafted IP packets" that are continuously forwarded.
https://exchange.xforce.ibmcloud.com/vulnerabilities/19470
http://www.securityfocus.com/bid/12648
http://www.cisco.com/warp/public/707/cisco-sa-20050224-acnsdos.shtml