CVE-2006-4774
The VLAN Trunking Protocol (VTP) feature in Cisco IOS 12.1(19) allows remote attackers to cause a denial of service by sending a VTP version 1 summary frame with a VTP version field value of 2.
Date published : 2006-09-13
http://www.securityfocus.com/bid/19998
http://www.securityfocus.com/archive/1/445896/100/0/threaded