Executive brief
The Tenda 5G03 router, a device used for high-speed 5G wireless internet connectivity, contains a security flaw in its telephony management interface. An attacker with access to the device's management console can inject malicious commands through the phone dialing feature. If exploited, this allows the attacker to take full control of the router, potentially leading to intercepted internet traffic, service disruptions, or unauthorized access to the local network.
Technical details
A command injection vulnerability exists in the Tenda 5G03 router firmware version V05.03.02.04. The flaw is located within the 'action_dial_call' function in the '/usr/lib/lua/luci/controller/admin/telephony.lua' script. The 'dialNumber' parameter is processed without sufficient sanitization or validation before being passed to a system shell. An authenticated attacker can exploit this by sending a specially crafted POST request to the telephony trigger endpoint, allowing for arbitrary command execution with the privileges of the web service. A proof-of-concept exploit demonstrates that appending shell metacharacters to the dial number can trigger the execution of unauthorized system commands.
Affected products
- Tenda 5G03 V05.03.02.04 (Version 1.0)
Timeline
- 2026-03-16: other: Vulnerability submitted to vendor/research community
- 2026-06-15: disclosed: CVE published