CVE-2005-4440

MediumCVSS 5.0/10Last modified Jun 16, 2026

Description

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."

Metrics

CVSS 2.0 5.0/10AV:N/AC:L/Au:N/C:N/I:P/A:N

Affected software

No affected versions have been published.

Timeline

Published: Dec 21, 2005
Last modified: Jun 16, 2026
NVD status: Modified

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