TP-Link WDR Series devices through firmware v3 (such as TL-WDR5620 V3.0) are affected by command injection (after login) leading to remote code execution, because shell metacharacters can be included in the weather get_weather_observe citycode field.
https://github.com/0xcc-Since2016/TP-Link-WDR-Router-Command-injection_POC/blob/master/poc.py