# CVE-2019-13555: Denial of service in Mitsubishi Electric MELSEC-Q Series Q03/04/06/13/26UDVCPU: serial number 21081 and prior, Q04/06/13/26UDPVCPU: serial number 21081 and prior, and Q03UDECPU, Q04/06/10/13/20/26/50/100UDEHCPU: serial number 21081 and prior. MELSEC-L Series L02/06/26CPU, L26CPU-BT: serial number 21101 and prior, L02/06/26CPU-P, L26CPU-PBT: serial number 21101 and prior, and L02/06/26CPU-CM, L26CPU-BT-CM: serial number 21101 and prior.

> A remote attacker can cause a denial-of-service condition in Mitsubishi Electric MELSEC PLCs by exploiting a timing-dependent flaw in the FTP service.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/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:** 13 Nov 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-r5rh-4cpr-qxhj

## What is CVE-2019-13555?

CVE-2019-13555 is a medium-severity denial of service vulnerability in Mitsubishi Electric MELSEC-Q Series Q03/04/06/13/26UDVCPU: serial number 21081 and prior, Q04/06/13/26UDPVCPU: serial number 21081 and prior, and Q03UDECPU, Q04/06/10/13/20/26/50/100UDEHCPU: serial number 21081 and prior. MELSEC-L Series L02/06/26CPU, L26CPU-BT: serial number 21101 and prior, L02/06/26CPU-P, L26CPU-PBT: serial number 21101 and prior, and L02/06/26CPU-CM, L26CPU-BT-CM: serial number 21101 and prior., published on 13 Nov 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In Mitsubishi Electric MELSEC-Q Series Q03/04/06/13/26UDVCPU: serial number 21081 and prior, Q04/06/13/26UDPVCPU: serial number 21081 and prior, and Q03UDECPU, Q04/06/10/13/20/26/50/100UDEHCPU: serial number 21081 and prior, MELSEC-L Series L02/06/26CPU, L26CPU-BT: serial number 21101 and prior, L02/06/26CPU-P, L26CPU-PBT: serial number 21101 and prior, and L02/06/26CPU-CM, L26CPU-BT-CM: serial number 21101 and prior, a remote attacker can cause the FTP service to enter a denial-of-service condition dependent on the timing at which a remote attacker connects to the FTP server on the above CPU modules.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2019-13555?

It affects 10 products.


Products: Mitsubishielectric L02\/06\/26cpu-Cm Firmware, Mitsubishielectric L02\/06\/26cpu-P Firmware, Mitsubishielectric L02\/06\/26cpu Firmware, Mitsubishielectric L26cpu-Bt-Cm Firmware, Mitsubishielectric L26cpu-Bt Firmware, Mitsubishielectric L26cpu-Pbt Firmware, Mitsubishielectric Q03\/04\/06\/13\/26udvcpu Firmware, Mitsubishielectric Q03udecpu Firmware, Mitsubishielectric Q04\/06\/10\/13\/20\/26\/50\/100udehcpu Firmware, Mitsubishielectric Q04\/06\/13\/26udpvcpu Firmware.

## How do I fix CVE-2019-13555?

No fix has been published for CVE-2019-13555 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-13555 being exploited?

There is no known exploitation of CVE-2019-13555 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-13555 and fix it if it is affected.

What it is: CVE-2019-13555 is a medium-severity denial of service vulnerability in Mitsubishi Electric MELSEC-Q Series Q03/04/06/13/26UDVCPU: serial number 21081 and prior, Q04/06/13/26UDPVCPU: serial number 21081 and prior, and Q03UDECPU, Q04/06/10/13/20/26/50/100UDEHCPU: serial number 21081 and prior. MELSEC-L Series L02/06/26CPU, L26CPU-BT: serial number 21101 and prior, L02/06/26CPU-P, L26CPU-PBT: serial number 21101 and prior, and L02/06/26CPU-CM, L26CPU-BT-CM: serial number 21101 and prior., published on 13 Nov 2019. 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-2019-13555 in the wild and no public exploit code.

Affected product: Mitsubishi Electric MELSEC-Q Series Q03/04/06/13/26UDVCPU: serial number 21081 and prior, Q04/06/13/26UDPVCPU: serial number 21081 and prior, and Q03UDECPU, Q04/06/10/13/20/26/50/100UDEHCPU: serial number 21081 and prior. MELSEC-L Series L02/06/26CPU, L26CPU-BT: serial number 21101 and prior, L02/06/26CPU-P, L26CPU-PBT: serial number 21101 and prior, and L02/06/26CPU-CM, L26CPU-BT-CM: serial number 21101 and prior.. 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-2019-13555/ (Markdown: https://insights.sbomify.com/CVE-2019-13555/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-13555
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-13555
- OSV: https://osv.dev/vulnerability/CVE-2019-13555

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-13555/
Summaries are generated and may contain mistakes; the official description above is the record.