CVE-2023-6374: melsec — Fix

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.

Is your site exposed to CVE-2023-6374?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

5.9

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Weakness Type (CWE)

CWE-294 CWE-294

Affected Products

Vendor	Product	Versions
mitsubishielectric	melsec_ws0-geth00200_firmware	All
mitsubishielectric	melsec_ws0-geth00200	All

References

Advisories & Patches

https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2023-019_en.pdf https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2023-019_en.pdf

Other References

https://jvn.jp/vu/JVNVU99497477 https://www.cisa.gov/news-events/ics-advisories/icsa-24-030-03 https://jvn.jp/vu/JVNVU99497477 https://www.cisa.gov/news-events/ics-advisories/icsa-24-030-03

Frequently Asked Questions

What is CVE-2023-6374? +

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. It has a CVSS v3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2023-6374? +

CVE-2023-6374 has a CVSS v3.1 score of 5.9 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2023-6374? +

CVE-2023-6374 affects products from mitsubishielectric, specifically: melsec_ws0-geth00200, melsec_ws0-geth00200_firmware. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2023-6374? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2025-8616

A weakness identified in OpenText Advanced Authentication where a Malicious browser plugin can record and replay the user authentication process …

CVE-2026-56130

"Remember me" cookie age is not verified on the server. This potentially allows an attacker to intercept a valid cookie …

CVE-2026-57574

Misskey is an open source, federated social media platform. Prior to 2026.6.0, Misskey contains a vulnerability in Time-based One-Time Password …

CVE-2024-38284

Transmitted data is logged between the device and the backend service. An attacker could use these logs to perform a …

CVE-2026-53431

Authentication Bypass by Capture-replay vulnerability in malach-it Boruta allows an attacker who has obtained a previously valid JWT client assertion …

CVE-2026-34021

The Wertheim SafeController 5400, Controller 5400 - AssemblyVersion 6.11.8130.22320, uses RS-485 communication between the server and the microcontroller without cryptographic …

CVE-2023-6374