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CVE-2005-4440

5.0 · MEDIUM

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 downst…

Published Dec 21, 2005vlan_protocolEPSS 1.61%

Overview

CVE-2005-4440 is a medium-severity vulnerability affecting vlan_protocol vlan_protocol. It was published on December 21, 2005 and has a CVSS 2.0 base score of 5.0 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 5.0, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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."

Remediation

Check the references section for vendor advisories and patches from vlan_protocol. Update vlan_protocol to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Reflists.grok.org.uk/pipermail/full-disclosure/2005-December/040333.htmlRefwww.securityfocus.com/archive/1/419831/100/0/threadedRefwww.securityfocus.com/archive/1/419834/100/0/threadedReflists.grok.org.uk/pipermail/full-disclosure/2005-December/040333.htmlRefwww.securityfocus.com/archive/1/419831/100/0/threadedRefwww.securityfocus.com/archive/1/419834/100/0/threaded

How CyberStrike helps

Frequently asked questions

What is CVE-2005-4440?

CVE-2005-4440 is a medium-severity vulnerability affecting vlan_protocol vlan_protocol. It was published on December 21, 2005 and has a CVSS 2.0 base score of 5.0 (MEDIUM).

How severe is CVE-2005-4440?

This vulnerability has a CVSS 2.0 base score of 5.0, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2005-4440?

Check the references section for vendor advisories and patches from vlan_protocol. Update vlan_protocol to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2005-4440?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2005-4440 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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