Executive brief
A security vulnerability exists in the Totolink A8000RU wireless router, a device used to provide internet connectivity and Wi-Fi. An attacker can remotely take full control of the router by sending a specially crafted request to its web management interface. This could lead to the theft of sensitive data, interception of network traffic, or a complete shutdown of the internet service for connected users.
Technical details
An OS command injection vulnerability exists in the Totolink A8000RU router (firmware version 7.1cu.643_b20200521) within the /cgi-bin/cstecgi.cgi component. The flaw is located in the setWiFiAdvancedCfg function, where the 'bgProtection' argument is improperly neutralized before being passed to the CsteSystem function and subsequently executed via execv(). A remote, unauthenticated attacker can exploit this by sending a crafted HTTP POST request containing shell metacharacters (e.g., backticks) in the JSON payload. Successful exploitation allows for arbitrary command execution with the privileges of the web server. Public exploit code (PoC) has been released.
Affected products
- Totolink A8000RU 7.1cu.643_b20200521
Timeline
- 2026-05-25: advisory: NVD publication date
- 2026-05-25: disclosed: Public exploit released via GitHub