TOTOLINK NR1800X setOpModeCfg buffer overflow vulnerability

TOTOLINK NR1800X is an excellent 5G NR indoor Wi-Fi and SIP CPE from China Gion Electronics (TOTOLINK).Designed to provide fast and convenient deployment of NR fixed data services for homes and offices.TOTOLINK NR1800X V9.1.0u.6279_B20210910 version is vulnerable to a buffer overflow vulnerability, which originates from the file / cgi-bin/cstecgi.cgi in the setOpModeCfg function does not validate the pppoeUser parameter size, and an attacker can exploit the vulnerability to trigger a stack overflow and remotely execute code.