Double-Tagging VLAN Jumping Attack

CVE-2005-4440 · MEDIUM Severity

AV:N/AC:L/AU:N/C:N/I:P/A:N

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."

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