CVE-2021-26810: Improper Neutralization of Special Elements used in an OS Command

D-link DIR-816 A2 v1.10 is affected by a remote code injection vulnerability. An HTTP request parameter can be used in command string construction in the handler function of the /goform/dirsetWanWifi, which can lead to command injection via shell metacharacters in the statuscheckpppoeuser paramet...