Overview
CVE-2025-3699 is a critical cybersecurity vulnerability that affects multiple versions of Mitsubishi Electric Corporation’s Heating, Ventilation, and Air Conditioning (HVAC) systems. This vulnerability allows an unauthenticated attacker to remotely bypass authentication and gain control over these systems, leading to potential unauthorized access to sensitive information and possible system manipulation.
The vulnerability is of significant concern due to the wide range of affected products and the potential consequences that could ensue if the systems were compromised. Unauthorized control of HVAC systems could lead to significant financial losses, data breaches, and even impact the physical well-being of people in conditioned environments.
Vulnerability Summary
CVE ID: CVE-2025-3699
Severity: Critical (9.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Unauthorized system control, information disclosure, potential firmware tampering
Affected Products
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Product | Affected Versions
Mitsubishi Electric Corporation G-50 | Version 3.37 and prior
Mitsubishi Electric Corporation GB-50A | Version 3.37 and prior
Mitsubishi Electric Corporation AE-200A | Version 8.01 and prior
Mitsubishi Electric Corporation EW-50E | Version 8.01 and prior
Mitsubishi Electric Corporation CMS-RMD-J | Version 1.40 and prior
How the Exploit Works
The vulnerability lies in the systems’ lack of sufficient authentication measures. An attacker can exploit this flaw by sending specially crafted requests to the HVAC systems over the network. These malicious requests could allow the attacker to bypass the authentication process and gain unauthorized access to the system’s controls or data.
Furthermore, the revelation of the system’s information could potentially allow an attacker to manipulate the firmware, opening the door to more extensive system control and potential manipulation.
Conceptual Example Code
The following pseudocode illustrates a conceptual example of how an attacker might exploit this vulnerability:
POST /HVAC/control HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "command": "override_auth", "execute": "full_control" }In this example, the attacker sends a POST request to the HVAC control endpoint, with a JSON payload designed to override the system’s authentication process and grant the attacker full control over the system.