Phicomm FIR151B A2, FIR302E A2, FIR300B A2, FIR303B A2 routers V3.0.1.17 were discovered to contain a remote command execution (RCE) vulnerability via the sendnum parameter of the ping function.
https://github.com/SLoSnow9879/Feixun_Router/blob/main/Ping_1.md