A vulnerability described as critical has been identified in Tenda CX12L 16.03.53.12 . The affected element is the function form_fast_setting_wifi_set of the file /goform/fast_setting_wifi_set of the component Wi-Fi Configuration Endpoint . Such manipulation of the argument ssid leads to stack-based buffer overflow. This vulnerability is uniquely identified as CVE-2026-11503 . The attack can be launched remotely. Moreover, an exploit is present.