A vulnerability, which was classified as critical , was found in Totolink A8000RU 7.1cu.643_b20200521 . The impacted element is the function setL2tpServerCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface . Executing a manipulation of the argument enable can lead to os command injection. This vulnerability is handled as CVE-2026-9436 . The attack can be executed remotely. Additionally, an exploit exists.