CVE-2025-4008

What is Smartbedded Meteobridge?

Meteobridge is a specialized IoT firmware and hardware product from Smartbedded (Germany) that serves as a bridge between personal weather stations (Davis Vantage Pro, Oregon Scientific, etc.) and internet weather networks (Weather Underground, AWEKAS, Weather.com, etc.). It typically runs as firmware on consumer router hardware (TP-Link, D-Link, ASUS routers repurposed as weather data gateways) or as a virtual machine image.

Meteobridge deployments range from amateur weather enthusiasts to professional installations at airports, agricultural stations, and research sites. Many are internet-accessible for remote monitoring — placing them in the same risk category as other IoT devices: running embedded Linux, often with default or no credentials, and rarely updated.

Overview

CVE-2025-4008 is a command injection vulnerability (CWE-77) in the Smartbedded Meteobridge web management interface that allows an unauthenticated attacker on the adjacent network to execute arbitrary OS commands as root on the device. The vulnerability is in the CGI-based web management interface which lacks authentication on the vulnerable endpoint. Active exploitation was confirmed before CISA's KEV listing on October 2, 2025, with a 21-day remediation deadline. The vendor recommends against internet exposure of Meteobridge devices.

Affected Versions

Technical Details

The command injection (CWE-77) is in the Meteobridge web management interface CGI handler. The interface exposes a configuration endpoint that, despite being intended for admin use, lacks authentication checks (CWE-306: Missing Authentication). User-supplied input to this endpoint is passed without sanitization to an OS shell command, allowing injection of arbitrary shell commands via standard metacharacters (;, |, $(), etc.).

Since Meteobridge's embedded Linux web server runs as root (common in compact IoT firmware), injected commands execute with full root privileges on the device's underlying system.

Adjacent network attack vector (AV:A): The CVSS adjacent network rating reflects that Meteobridge devices are designed for LAN access, though many are also internet-accessible via port forwarding or exposed via Shodan/Censys. Direct internet exploitation is possible for internet-exposed instances.

Exploitation use cases:

• IoT botnet recruitment (Mirai variants target command-injectable weather station firmware)
• Network pivoting through the gateway router hardware
• Data exfiltration of weather station API credentials and network configuration

Discovery

ONEKEY GmbH (the CNA for this CVE).

Exploitation Context

CISA confirmed active exploitation and KEV-listed October 2, 2025 — nearly five months after the May 2025 patch. The extended gap between patch and KEV listing reflects that many Meteobridge devices run without monitoring or update mechanisms. The KEV listing specifically notes that Meteobridge is KEV'd despite being specialized IoT firmware, reflecting the risk that internet-exposed weather stations become botnet infrastructure or network pivots.

Remediation

1. Update Meteobridge firmware to 6.2 or later. Download from the Meteohub forum/Smartbedded website. The CISA deadline was October 23, 2025.
2. Do not expose Meteobridge to the internet — the vendor's own advisory discourages internet exposure. Remove port forwarding rules that expose the Meteobridge web interface.
3. Place Meteobridge on an isolated IoT VLAN with no routing to internal production networks.
4. Change default credentials if the device uses them.
5. If immediate update is impossible, disable the web management interface via LAN-side firewall rules until firmware can be updated.