A vulnerability was found in Totolink A8000RU 7.1cu.643_b20200521 and classified as critical . Impacted is the function setLanguageCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface . Such manipulation of the argument lang leads to os command injection. This vulnerability is listed as CVE-2026-9386 . The attack may be performed from remote. In addition, an exploit is available.