A vulnerability was found in Totolink A8000RU 7.1cu.643_b20200521 . It has been classified as critical . The affected element is the function setUpgradeFW of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface . Performing a manipulation of the argument resetFlags results in os command injection. This vulnerability is cataloged as CVE-2026-9387 . It is possible to initiate the attack remotely. Furthermore, there is an exploit available.