D-Link DIR-600 Hardware Version B5, Firmware Version 2.18 was discovered to contain a command injection vulnerability via the ST parameter in the lxmldbc_system() function.
https://www.dlink.com/en/security-bulletin/
https://hackmd.io/%40naihsin/By2datZD2
https://github.com/naihsin/IoT/tree/main/D-Link/DIR-600/cmd%20injection
https://github.com/naihsin/IoT/blob/main/D-Link/DIR-600/cmd%20injection/README.md