# CVE-2023-2846: Authentication Bypass Vulnerability in MELSEC-F Series main module

> Remote attackers can bypass authentication and log in to Mitsubishi MELSEC-F PLCs by replaying captured packets, compromising industrial control systems.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Jun 2023
- **Updated:** 5 Mar 2025
- **Also known as:** GHSA-f86h-3pcp-x4mw

## What is CVE-2023-2846?

CVE-2023-2846 is a high-severity authentication bypass vulnerability in Mitsubishi Electric Corporation MELSEC-F Series FX3G-14MR/DS, published on 30 Jun 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Authentication Bypass by Capture-replay vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series main modules allows a remote unauthenticated attacker to cancel the password/keyword setting and login to the affected products by sending specially crafted packets.

Weakness: CWE-294 (Authentication Bypass by Capture-replay)

## Which versions are affected by CVE-2023-2846?

It affects 150 products.


Products: Mitsubishielectric Fx3g-14mr\/Ds Firmware, Mitsubishielectric Fx3g-14mr\/Es-a Firmware, Mitsubishielectric Fx3g-14mr\/Es Firmware, Mitsubishielectric Fx3g-14mt\/Ds Firmware, Mitsubishielectric Fx3g-14mt\/Dss Firmware, Mitsubishielectric Fx3g-14mt\/Es-a Firmware, Mitsubishielectric Fx3g-14mt\/Es Firmware, Mitsubishielectric Fx3g-14mt\/Ess Firmware, Mitsubishielectric Fx3g-24mr\/Ds Firmware, Mitsubishielectric Fx3g-24mr\/Es-a Firmware, Mitsubishielectric Fx3g-24mr\/Es Firmware, Mitsubishielectric Fx3g-24mt\/Ds Firmware, Mitsubishielectric Fx3g-24mt\/Dss Firmware, Mitsubishielectric Fx3g-24mt\/Es-a Firmware, Mitsubishielectric Fx3g-24mt\/Es Firmware, Mitsubishielectric Fx3g-24mt\/Ess Firmware, Mitsubishielectric Fx3g-40mr\/Ds Firmware, Mitsubishielectric Fx3g-40mr\/Es-a Firmware, Mitsubishielectric Fx3g-40mr\/Es Firmware, Mitsubishielectric Fx3g-40mt\/Ds Firmware and 130 more.

## How do I fix CVE-2023-2846?

No fix has been published for CVE-2023-2846 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-2846 being exploited?

There is no known exploitation of CVE-2023-2846 in the wild and no public exploit code.

## Other vulnerabilities in Mitsubishi Electric Corporation MELSEC-F Series FX3G-14MR/DS

- [CVE-2023-4699](https://insights.sbomify.com/CVE-2023-4699/): Missing authorization in MELSEC L Series LD77MS16 (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-2846 and fix it if it is affected.

What it is: CVE-2023-2846 is a high-severity authentication bypass vulnerability in Mitsubishi Electric Corporation MELSEC-F Series FX3G-14MR/DS, published on 30 Jun 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-2023-2846 in the wild and no public exploit code.

Affected product: Mitsubishi Electric Corporation MELSEC-F Series FX3G-14MR/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-2023-2846/ (Markdown: https://insights.sbomify.com/CVE-2023-2846/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-2846
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-2846
- OSV: https://osv.dev/vulnerability/CVE-2023-2846

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-2846/
Summaries are generated and may contain mistakes; the official description above is the record.