The ADB (formerly Pirelli Broadband Solutions) P.DGA4001N router with firmware PDG_TEF_SP_4.06L.6, and possibly other routers, uses "1236790" and the MAC address to generate the WPA key.
The ADB (formerly Pirelli Broadband Solutions) P.DGA4001N router with firmware PDG_TEF_SP_4.06L.6 does not properly restrict access to the web interface, which allows remote attackers to obtain sensitive information or cause a denial of service (device restart) as demonstrated by a direct request to (1) wlsecurity.html or (2) resetrouter.html.