# CVE-2023-3346: Denial of Service (DoS) and Remote Code Execution Vulnerability in MITSUBISHI CNC Series

> Remote unauthenticated attackers can cause denial of service and execute arbitrary code on Mitsubishi CNC systems via crafted packets.

- **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:** 3 Aug 2023
- **Updated:** 4 Dec 2024
- **Also known as:** GHSA-whh9-m2fc-3q2v

## What is CVE-2023-3346?

CVE-2023-3346 is a critical memory corruption vulnerability in MITSUBISHI CNC C80 Series C80, published on 3 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in MITSUBSHI CNC Series allows a remote unauthenticated attacker to cause Denial of Service (DoS) condition and execute arbitrary code on the product by sending specially crafted packets. In addition, system reset is required for recovery.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2023-3346?

It affects 21 products.


Products: Mitsubishielectric C80 Firmware, Mitsubishielectric E70 Firmware, Mitsubishielectric E80 Firmware, Mitsubishielectric M70v Firmware, Mitsubishielectric M720vs 15-Type Firmware, Mitsubishielectric M720vs Firmware, Mitsubishielectric M720vw Firmware, Mitsubishielectric M730vs 15-Type Firmware, Mitsubishielectric M730vs Firmware, Mitsubishielectric M730vw Firmware, Mitsubishielectric M750vs 15-Type Firmware, Mitsubishielectric M750vs Firmware, Mitsubishielectric M750vw Firmware, Mitsubishielectric M800s Firmware, Mitsubishielectric M800vs Firmware, Mitsubishielectric M800vw Firmware, Mitsubishielectric M800w Firmware, Mitsubishielectric M80 Firmware, Mitsubishielectric M80v Firmware, Mitsubishielectric M80vw Firmware and 1 more.

## How do I fix CVE-2023-3346?

No fix has been published for CVE-2023-3346 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-3346 being exploited?

There is no known exploitation of CVE-2023-3346 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-3346 and fix it if it is affected.

What it is: CVE-2023-3346 is a critical memory corruption vulnerability in MITSUBISHI CNC C80 Series C80, published on 3 Aug 2023. 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-2023-3346 in the wild and no public exploit code.

Affected product: MITSUBISHI 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-2023-3346/ (Markdown: https://insights.sbomify.com/CVE-2023-3346/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-3346
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-3346
- OSV: https://osv.dev/vulnerability/CVE-2023-3346

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-3346/
Summaries are generated and may contain mistakes; the official description above is the record.