Executive brief
A security vulnerability has been identified in the Totolink A8000RU wireless router, a device used to provide internet connectivity and Wi-Fi management. An attacker can remotely exploit this flaw to take full control of the router by executing unauthorized system commands. This could lead to the interception of network traffic, disruption of internet services, or unauthorized access to other devices on the local network.
Technical details
An OS command injection vulnerability exists in the Totolink A8000RU router (firmware version 7.1cu.643_b20200521) within the web management interface. The flaw is located in the 'setWiFiWpsCfg' function of the '/cgi-bin/cstecgi.cgi' component. The root cause is improper neutralization of the 'wscDisabled' parameter, which is passed to the 'Uci_Set_Str' function and eventually executed via 'execv()' in 'CsteSystem'. A remote, unauthenticated attacker can exploit this by sending a specially 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 disclosed.
Affected products
- Totolink A8000RU 7.1cu.643_b20200521
Timeline
- 2026-05-25: disclosed: Vulnerability disclosed and CVE assigned
- 2026-05-25: advisory: NVD published the vulnerability details