# CVE-2020-5531: Other in Mitsubishi Electric MELSEC C Controller Module and MELIPC Series MI5000

> Remote attackers can cause denial of service or execute malware on Mitsubishi Electric MELSEC controllers via unspecified vectors.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Feb 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-ffqg-m22j-5p83

## What is CVE-2020-5531?

CVE-2020-5531 is a critical vulnerability in Mitsubishi Electric MELSEC C Controller Module and MELIPC Series MI5000, published on 17 Feb 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Mitsubishi Electric MELSEC C Controller Module and MELIPC Series MI5000 MELSEC-Q Series C Controller Module(Q24DHCCPU-V, Q24DHCCPU-VG User Ethernet port (CH1, CH2): First 5 digits of serial number 21121 or before), MELSEC iQ-R Series C Controller Module / C Intelligent Function Module(R12CCPU-V Ethernet port (CH1, CH2): First 2 digits of serial number 11 or before, and RD55UP06-V Ethernet port: First 2 digits of serial number 08 or before), and MELIPC Series MI5000(MI5122-VW Ethernet port (CH1): First 2 digits of serial number 03 or before, or the firmware version 03 or before) allow remote attackers to cause a denial of service and/or malware being executed via unspecified vectors.

## Which versions are affected by CVE-2020-5531?

It affects 5 products.


Products: Mitsubishielectric Mi5122-Vw Firmware, Mitsubishielectric Q24dhccpu-v Firmware, Mitsubishielectric Q24dhccpu-Vg Firmware, Mitsubishielectric R12ccpu-v Firmware, Mitsubishielectric Rd55up06-v Firmware.

## How do I fix CVE-2020-5531?

No fix has been published for CVE-2020-5531 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-5531 being exploited?

There is no known exploitation of CVE-2020-5531 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-5531 and fix it if it is affected.

What it is: CVE-2020-5531 is a critical vulnerability in Mitsubishi Electric MELSEC C Controller Module and MELIPC Series MI5000, published on 17 Feb 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-5531 in the wild and no public exploit code.

Affected product: Mitsubishi Electric MELSEC C Controller Module and MELIPC Series MI5000. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2020-5531/ (Markdown: https://insights.sbomify.com/CVE-2020-5531/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-5531
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-5531
- OSV: https://osv.dev/vulnerability/CVE-2020-5531

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-5531/
Summaries are generated and may contain mistakes; the official description above is the record.