Directory Traversal vulnerability in appdatacenter on Shenzhen Tenda Ac9 USAC9V1.0BRV15.03.05.14multiTD01, Ac9 ac9kfV15.03.05.19(6318)cn, Ac15 USAC15V1.0BRV15.03.05.18multiTD01, Ac15 USAC15V1.0BRV15.03.05.19multiTD01, Ac18 USAC18V1.0BRV15.03.05.05multiTD01, and Ac18 ac18kfV15.03.05.19(6318)cn devices allows remote unauthenticated attackers to read arbitrary files via a cgi-bin/luci/request?op=1&path= URI that uses directory traversal sequences after a /usb/ substring.