CVE-2026-19814 | TOTOLINK A800R 4.1.2cu.5137_B20200730 firewall.so /cgi-bin/cstecgi.cgi setMacQos macAddress stack-based overflow

A vulnerability was found in TOTOLINK A800R 4.1.2cu.5137_B20200730. It has been rated as critical. Affected is the function setMacQos of the file /cgi-bin/cstecgi.cgi of the component firewall.so. Performing a manipulation of the argument macAddress results in stack-based buffer overflow.

This vulnerability is cataloged as CVE-2026-19814. It is possible to initiate the attack remotely. Furthermore, there is an exploit available.