Unspecified vulnerability in Stack Group Bidding Protocol (SGBP) support in Cisco IOS 12.0 through 12.4 running on various Cisco products, when SGBP is enabled, allows remote attackers on the local network to cause a denial of service (device hang and network traffic loss) via a crafted UDP packet to port 9900.
https://exchange.xforce.ibmcloud.com/vulnerabilities/24182
http://www.vupen.com/english/advisories/2006/0248
http://www.securityfocus.com/bid/16303
http://www.cisco.com/warp/public/707/cisco-sa-20060118-sgbp.shtml
http://securitytracker.com/id?1015501