The Cisco IOS Stack Group Bidding Protocol (SGBP) feature in certain versions of Cisco IOS software is vulnerable to a remotely-exploitable denial of service condition. Devices that do not support or have not enabled the SGBP protocol are not affected by this vulnerability.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/43329/cisco-sa-20060118-sgbp.txt
Source: https://packetstormsecurity.com/files/43329/Cisco-Security-Advisory-20060118-sgbp.html