A vulnerability classified as problematic has been found in FiberHome AN5506-01A ONU GPON RP2511. Affected is an unknown function of the file /goform/portForwardingCfg of the component Port Forwarding Submenu. The manipulation of the argument pf_Description leads to cross site scripting. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.