CVE-2008-4963: n/a vulnerability

CVE-2008-4963: Unspecified vulnerability in the VLAN Trunking Protocol (VTP) implementation on Cisco IOS and CatOS, when t...

Unspecified vulnerability in the VLAN Trunking Protocol (VTP) implementation on Cisco IOS and CatOS, when the VTP operating mode is not transparent, allows remote attackers to cause a denial of service (device reload or hang) via a crafted VTP packet sent to a switch interface configured as a trunk port.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 7, 2024, 10:31 UTC (UTC+00:00)

Security readout for executives and security teams

This flaw could let someone who can reach a Cisco switch trunk port disrupt the switch by sending a crafted VTP packet. The reported impact is a device reload or hang, which can interrupt network availability. Exposure depends on Cisco IOS or CatOS switches running VTP in a non-transparent mode on trunk interfaces. Most likely exposed assets are legacy Cisco IOS or CatOS switches with VTP enabled in server or client modes and interfaces configured as trunk ports. Internet exposure is not indicated in the record; practical reach appears network-adjacent or internal. Prioritize based on network role. Affected core or distribution switches could cause meaningful outages, but the provided evidence does not show active exploitation or broad internet exposure. Mitigation focus: Review Cisco's advisory for affected releases and official fixes.; Inventory Cisco IOS and CatOS switches using VTP non-transparent modes.; Reduce unnecessary trunk ports and restrict who can reach trunks..

Prepared: Jun 28, 2026, 18:33 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Nov 6, 2008, 11:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
cisco-ios-catos-vtp-dos(46346)CVE reference · vdb-entry, x_refsource_XF

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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