On Seowon Intech routers, there is a Command Injection vulnerability in diagnostic.cgi via shell metacharacters in the ping_ipaddr parameter.
Published June 12, 2019.
Seowonintech Swr-300b Firmware
Seowonintech Swr-300bg Firmware
Seowonintech Swr-300a Firmware
Seowonintech Swr-300c Firmware