CVE-2005-4440

The 802.1q VLAN protocol allows remote attackers to bypass network segmentation and spoof VLAN traffic via a message with two 802.1q tags, which causes the second tag to be redirected from a downstream switch after the first tag has been stripped, as demonstrated by Yersinia, aka "double-tagging VLAN jumping attack."

Date published : 2005-12-20

http://www.securityfocus.com/archive/1/419831/100/0/threaded

http://www.securityfocus.com/archive/1/419834/100/0/threaded