# CVE-2025-2399: Denial of Service (DoS) Vulnerability in Mitsubishi Electric CNC Series

> Remote attackers can cause denial of service on Mitsubishi Electric CNC controllers by sending crafted packets to TCP port 683.

- **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:** 10 Mar 2026
- **Updated:** 27 Aug 2026
- **Also known as:** GHSA-9q59-gxh2-q9mf

## What is CVE-2025-2399?

CVE-2025-2399 is a medium-severity denial of service vulnerability in Mitsubishi Electric CNC C80 Series C80, published on 10 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper Validation of Specified Index, Position, or Offset in Input vulnerability in Mitsubishi Electric CNC M800V Series M800VW and M800VS, M80V Series M80V and M80VW, M800 Series M800W and M800S, M80 Series M80 and M80W, E80 Series E80, C80 Series C80, and M700V Series M750VW, M720VW, 730VW, M720VS, M730VS, and M750VS, M70V Series M70V, E70 Series E70 allows a remote attacker to cause an out-of-bounds read, resulting in a denial-of-service condition by sending specially crafted packets to TCP port 683.

Weakness: CWE-1285 (Improper Validation of Specified Index, Position, or Offset in Input)

## Which versions are affected by CVE-2025-2399?


## How do I fix CVE-2025-2399?

No fix has been published for CVE-2025-2399 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-2399 being exploited?

There is no known exploitation of CVE-2025-2399 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-2399 and fix it if it is affected.

What it is: CVE-2025-2399 is a medium-severity denial of service vulnerability in Mitsubishi Electric CNC C80 Series C80, published on 10 Mar 2026. 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-2025-2399 in the wild and no public exploit code.

Affected product: Mitsubishi Electric CNC C80 Series C80. 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-2025-2399/ (Markdown: https://insights.sbomify.com/CVE-2025-2399/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-2399
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-2399
- OSV: https://osv.dev/vulnerability/CVE-2025-2399

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-2399/
Summaries are generated and may contain mistakes; the official description above is the record.