Meteobridge web interface Vulnerability Let Attackers Inject Commands Remotely
ONEKEY Research Lab has uncovered a severe command injection vulnerability in the MeteoBridge firmware, a compact device designed to connect personal weather stations to public weather networks like Weather Underground.
This flaw, identified through ONEKEY’s recently introduced bash static code analysis on their platform, affects versions 6.1 and below of the MeteoBridge firmware, enabling remote, unauthenticated attackers to execute arbitrary commands with root privileges.
The vulnerability, now assigned CVE-2025-4008, has been patched in version 6.2 following a coordinated disclosure process. With a CVSS score of 8.7 (High), the impact of this issue underscores the critical need for robust firmware security in Internet-connected devices.
Critical Flaw Exposes Weather Station Devices
The vulnerability resides in the MeteoBridge web interface, specifically within the CGI shell script accessible at /cgi-bin/template.cgi.
This endpoint processes user input from the $QUERY_STRING variable without proper sanitization, feeding it directly into an eval call a notorious vector for command injection attacks.
As a result, malicious actors can craft HTTP requests to execute arbitrary system commands on the device.
Making matters worse, an authentication bypass exists due to a misconfiguration in the uhttpd server settings.
Unauthenticated Exploitation via Public Endpoint
While certain directories like /cgi-bin are protected by basic authentication, the affected script is also exposed in an unprotected /public directory, allowing attackers to bypass login requirements entirely.
This dual flaw means that anyone with network access potentially even over the Internet can exploit the system without credentials.
Shodan data indicates that between 70 and 130 MeteoBridge devices are visible online at any given time, amplifying the risk of real-world exploitation despite the vendor’s advisory cautioning against Internet exposure.
Further compounding the threat, the attack can be executed via a simple GET request, making it possible to craft malicious web links or embed exploit code in seemingly innocuous elements like
A victim merely needs to click a link pointing to http://[target]/public/template.cgi?templatefile=$(command) to trigger the exploit, enabling scenarios like remote code execution through social engineering.
ONEKEY demonstrated this with a proof-of-concept using curl commands, confirming that attackers can not only inject commands but also retrieve their output in the HTTP response, providing immediate feedback on the success of their malicious actions.
This discovery highlights the power of ONEKEY’s automated bash static analysis, which flagged the issue during a routine scan of their firmware corpus.
According to the Report, The proactive identification of this flaw, followed by a structured disclosure timeline involving multiple notifications to Smartbedded (the vendor) and coordination with the German BSI, showcases the importance of responsible vulnerability handling.
Despite initial challenges, including the deletion of a forum post and account by MeteoBridge administrators, persistence paid off with the release of a patch on May 14, 2025, as detailed in the vendor’s advisory.
For users, upgrading to version 6.2 is critical, while organizations managing firmware must leverage automated tools like ONEKEY’s platform to detect and mitigate such shell script vulnerabilities before they become exploitable threats in the wild.
This incident serves as a stark reminder of the hidden dangers in IoT devices and the need for continuous security vigilance.