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An issue was discovered on Dasan GPON home routers. Command Injection can occur via the desthost parameter in a diagaction=ping request to a GponForm/diagForm URI. Because the router saves ping results in /tmp and transmits them to the user when the user revisits /diag.html, it's quite simple to execute commands and retrieve their output.
An issue was discovered on Dasan GPON home routers. It is possible to bypass authentication simply by appending "?images" to any URL of the device that requires authentication, as demonstrated by the /menu.html?images/ or /GponForm/diagFORM?images/ URI. One can then manage the device.