# CVE-2023-6374: Auth bypass in MELSEC WS Series WS0-GETH00200

> Remote attackers can bypass authentication via replay attacks to access and modify PLC programs and parameters in Mitsubishi MELSEC WS modules.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/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 Jan 2024
- **Updated:** 9 Jun 2025
- **Also known as:** GHSA-v334-55hv-wvc6

## What is CVE-2023-6374?

CVE-2023-6374 is a medium-severity authentication bypass vulnerability in Mitsubishi Electric Corporation MELSEC WS Series WS0-GETH00200, published on 30 Jan 2024. 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 WS Series WS0-GETH00200 all serial numbers allows a remote unauthenticated attacker to bypass authentication by capture-replay attack and illegally login to the affected module. As a result, the remote attacker who has logged in illegally may be able to disclose or tamper with the programs and parameters in the modules.

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

## Which versions are affected by CVE-2023-6374?

It affects 1 product.


Products: Mitsubishielectric Melsec Ws0-Geth00200 Firmware.

## How do I fix CVE-2023-6374?

No fix has been published for CVE-2023-6374 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-6374 being exploited?

There is no known exploitation of CVE-2023-6374 in the wild and no public exploit code.

## Other vulnerabilities in Mitsubishi Electric Corporation MELSEC WS Series WS0-GETH00200

- [CVE-2023-1618](https://insights.sbomify.com/CVE-2023-1618/): Authentication Bypass Vulnerability in MELSEC WS Series Ethernet Interface Module (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-6374 and fix it if it is affected.

What it is: CVE-2023-6374 is a medium-severity authentication bypass vulnerability in Mitsubishi Electric Corporation MELSEC WS Series WS0-GETH00200, published on 30 Jan 2024. 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-2023-6374 in the wild and no public exploit code.

Affected product: Mitsubishi Electric Corporation MELSEC WS Series WS0-GETH00200. 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-2023-6374/ (Markdown: https://insights.sbomify.com/CVE-2023-6374/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-6374
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-6374
- OSV: https://osv.dev/vulnerability/CVE-2023-6374

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-6374/
Summaries are generated and may contain mistakes; the official description above is the record.