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Vulnerability Score 5.0 5.0
CVE Id CVE-2005-4440
Last Modified 05 Sep 2008 04:56:53
Published 20 Dec 2005 09:03:00
Confidentiality Impact NONE NONE
Integrity Impact PARTIAL PARTIAL
Availability Impact NONE NONE
Access Vector NETWORK
Access Complexity LOW
Authentication NONE



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."

Vulnerable Systems


  • Vlan Protocol 802.1q


BUGTRAQ - 20051219 Re: Making unidirectional VLAN and PVLAN jumping bidirectional

BUGTRAQ - 20051219 Making unidirectional VLAN and PVLAN jumping bidirectional

Last Updated: 27 May 2016 10:41:18