CVE-2005-4440

· N/AModified

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CVSS v3.1

N/A

EPSS

1.61%

Published

Dec 21, 2005

Modified

Jun 16, 2026

Public PoC / Exploit

All weaponized →

No public PoC or exploit code indexed for this CVE.

Links to public security research (Exploit-DB, Nuclei, Trickest, GitHub) for defensive use only.

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 Products (1)

vlan_protocol · vlan_protocolvulnerable

References (6)

http://lists.grok.org.uk/pipermail/full-disclosure/2005-December/040333.html

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

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

http://lists.grok.org.uk/pipermail/full-disclosure/2005-December/040333.html

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

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

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