An issue in Dlink DIR-816A2 v.1.10CNB05 allows a remote attacker to execute arbitrary code via the wizardstep4_ssid_2 parameter in the sub_42DA54 function.
https://www.dlink.com/en/security-bulletin/
https://github.com/dkjiayu/Vul/blob/main/DIR816A2-dir_setWanWifi.md