CVE-2023-6943 Code injection in EZSocket

Critical 9.8 Published 30 Jan 2024 Updated 19 Sep 2025

Remote attackers can execute malicious code via unsafe reflection in Mitsubishi Electric industrial automation software.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2023-6943?

CVE-2023-6943 is a critical code injection vulnerability in Mitsubishi Electric Corporation EZSocket, published on 30 Jan 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') vulnerability in Mitsubishi Electric Corporation EZSocket versions 3.0 to 5.92, GT Designer3 Version1(GOT1000) versions 1.325P and prior, GT Designer3 Version1(GOT2000) versions 1.320J and prior, GX Works2 versions 1.11M to 1.626C, GX Works3 versions 1.106L and prior, MELSOFT Navigator versions 1.04E to 2.102G, MT Works2 versions 1.190Y and prior, MX Component versions 4.00A to 5.007H and MX OPC Server DA/UA all versions allows a remote unauthenticated attacker to execute a malicious code by RPC with a path to a malicious library while connected to the products.

Weakness: CWE-470

Which versions are affected by CVE-2023-6943?

It affects 10 products.

Products include Mitsubishielectric Ezsocket, Mitsubishielectric Fr Configurator2, Mitsubishielectric Got1000, Mitsubishielectric Got2000, Mitsubishielectric Gx Works2, Mitsubishielectric Gx Works3 and 4 more.

How do I fix CVE-2023-6943?

No fix has been published for CVE-2023-6943 yet. Limit exposure of the affected software until one is available.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2023-6943 being exploited?

There is no known exploitation of CVE-2023-6943 in the wild and no public exploit code.

Sources

Also known as GHSA-8g5q-mp2w-j766.