CVEvulnerability

CVE-2005-4440

5.0 MEDIUM Published 2005-12-21 Modified 2026-06-16 Official page ↗
Status
Modified
Published
2005-12-21
Last modified
2026-06-16
Assigner
[email protected]
CVSS 2.0 ([email protected])
5.0 MEDIUM — AV:N/AC:L/Au:N/C:N/I:P/A:N

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."

Affected configurations

• vlan protocol vlan protocol 802.1q

References