# CVE-2025-3699: Auth bypass in AE-200A

> Remote attackers can bypass authentication to control air conditioning systems, disclose information, and tamper with firmware.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Jun 2025
- **Updated:** 23 Dec 2025
- **Also known as:** GHSA-73r7-73gp-j7mv

## What is CVE-2025-3699?

CVE-2025-3699 is a critical authentication bypass vulnerability in Mitsubishi Electric Corporation AE-200A, published on 26 Jun 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2025-3699?


## How do I fix CVE-2025-3699?

No fix has been published for CVE-2025-3699 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-3699 being exploited?

There is no known exploitation of CVE-2025-3699 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-3699 and fix it if it is affected.

What it is: CVE-2025-3699 is a critical authentication bypass vulnerability in Mitsubishi Electric Corporation AE-200A, published on 26 Jun 2025. 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-2025-3699 in the wild and no public exploit code.

Affected product: Mitsubishi Electric Corporation AE-200A. 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-2025-3699/ (Markdown: https://insights.sbomify.com/CVE-2025-3699/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-3699
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-3699
- OSV: https://osv.dev/vulnerability/CVE-2025-3699

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-3699/
Summaries are generated and may contain mistakes; the official description above is the record.