In Linksys E5600 V1.1.0.26, the \usr\share\lua\runtime.lua file contains a command injection vulnerability in the runtime.pingTest function via the pt["count"] parameter.
The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.