An authentication bypass issue was discovered in Dasan Switch DS2924 web based interface, firmware versions 1.01.18 and 1.02.00, allowing attackers to gain escalated privileges via storing crafted cookies in the web browser.

DASAN GPON ONU H660WM OS version H660WMR210825 Hardware version DS-E5-583-A1 was discovered to contain insecure default credentials in the modem's control panel.

DASAN GPON ONU H660WM H660WMR210825 is susceptible to improper access control under its default settings. Attackers can exploit this vulnerability to gain unauthorized access to sensitive information and modify its configuration via the UPnP protocol WAN sides without any authentication.

Incorrect access control in the component /cgi-bin/systemdiagnosticmain.asp of DASAN GPON ONU H660WM H660WMR210825 allows attackers to access sensitive information.

DASAN H660GW devices have Stored XSS in the Port Forwarding functionality.

DASAN H660GW devices do not implement any CSRF protection mechanism.

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.