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.

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

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.

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 H660GW devices do not implement any CSRF protection mechanism.

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