A buffer overflow vulnerability exists in the Totolink N300RH router firmware version 3.2.4-B20220812. The flaw is in the setMacFilterRules function of the /cgi-bin/cstecgi.cgi POST request handler, where manipulation of the mac_address argument can lead to memory corruption. This vulnerability can be exploited remotely and has public exploit code available. It has a high severity rating with a CVSS score of 8.8.