A vulnerability labeled as critical has been found in Totolink A8000RU 7.1cu.643_b20200521 . The impacted element is the function setWanCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface . Such manipulation of the argument enabled leads to os command injection. This vulnerability is listed as CVE-2026-9458 . The attack may be performed from remote. In addition, an exploit is available.