# CVE-2015-3938: Denial of service in n/a

> Remote attackers can cause a denial of service on Mitsubishi Electric MELSEC FX3G PLC devices by sending a long parameter to the HTTP application.

- **Severity:** High 7.8 (`AV:N/AC:L/Au:N/C:N/I:N/A:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Oct 2015
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-r32j-v8jp-qvpq

## What is CVE-2015-3938?

CVE-2015-3938 is a high-severity denial of service vulnerability in n/a, published on 3 Oct 2015. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The HTTP application on Mitsubishi Electric MELSEC FX3G PLC devices before April 2015 allows remote attackers to cause a denial of service (device outage) via a long parameter.

Weakness: CWE-399

## Which versions are affected by CVE-2015-3938?

It affects 1 product.


Products: Mitsubishi Electric Melsec Fx3g.

## How do I fix CVE-2015-3938?

No fix has been published for CVE-2015-3938 yet. Limit exposure of the affected software until one is available.

## Is CVE-2015-3938 being exploited?

There is no known exploitation of CVE-2015-3938 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2015-3938 and fix it if it is affected.

What it is: CVE-2015-3938 is a high-severity denial of service vulnerability in n/a, published on 3 Oct 2015. 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-2015-3938 in the wild and no public exploit code.

Affected product: n/a. 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-2015-3938/ (Markdown: https://insights.sbomify.com/CVE-2015-3938/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2015-3938
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2015-3938
- OSV: https://osv.dev/vulnerability/CVE-2015-3938

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From sbomify Insights: https://insights.sbomify.com/CVE-2015-3938/
Summaries are generated and may contain mistakes; the official description above is the record.