# CVE-2025-5514: Denial-of-Service(DoS) Vulnerability in Web server function on MELSEC iQ-F Series CPU module

> Remote attackers can cause denial of service on Mitsubishi MELSEC iQ-F PLCs by sending crafted HTTP requests to the web server.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Aug 2025
- **Updated:** 26 Aug 2025
- **Also known as:** GHSA-hqhx-rf6h-xj5g

## What is CVE-2025-5514?

CVE-2025-5514 is a medium-severity denial of service vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-30MR/DS, published on 25 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper Handling of Length Parameter Inconsistency vulnerability in web server function on Mitsubishi Electric Corporation MELSEC iQ-F Series CPU module allows a remote unauthenticated attacker to delay the processing of the web server function and prevent legitimate users from utilizing the web server function, by sending a specially crafted HTTP request.

Weakness: CWE-130 (Improper Handling of Length Parameter Inconsistency)

## Which versions are affected by CVE-2025-5514?


## How do I fix CVE-2025-5514?

No fix has been published for CVE-2025-5514 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-5514 being exploited?

There is no known exploitation of CVE-2025-5514 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-5514 and fix it if it is affected.

What it is: CVE-2025-5514 is a medium-severity denial of service vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-30MR/DS, published on 25 Aug 2025. 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-2025-5514 in the wild and no public exploit code.

Affected product: Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-30MR/DS. 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-2025-5514/ (Markdown: https://insights.sbomify.com/CVE-2025-5514/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-5514
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-5514
- OSV: https://osv.dev/vulnerability/CVE-2025-5514

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From sbomify Insights: https://insights.sbomify.com/CVE-2025-5514/
Summaries are generated and may contain mistakes; the official description above is the record.