Cisco squashes VoIP, router bugs
An attacker could exploit the security hole by crafting a special network packet and sending that to a vulnerable Cisco system.
"Sending such a packet to port 9900 of an affected device will cause it to freeze and stop responding to, or passing traffic," Cisco said. After a delay, the device will reset, the company said. Devices that do not support or have not enabled the SGBP protocol are not affected by this vulnerability.