Insecure Password Reset?

When I tried to wake up my LG Windows 10 laptop this morning, although my WiFi was active, my Netgear AC1900 WiFi Cable Modem Router was not connected to the internet.  So I tried what usually works by hitting Disconnect and then restarting the connection.  The result was a screen I'd never seen since I purchased the modem/router in November of 2019: a "Netgear Genie" page demanding that I reset my password and security questions.  However, when I began to type in the password field, a warning popped up that the data I was entering was not secure and, when I looked, sure enough, the site address was not secure.  At this point I ran into a Catch 22: I couldn't access the internet to research whether or not the Netgear Genie screen was legitimate without completing the questionable data entry in order to gain access to the internet!

Since I'm posting here, I obviously bowed to the inevitable and entered the insecure security data, but I'd like to know where the Genie came from, why I'm seeing it for the first time in 2 years and 7 months, and whether or not my data security has been compromised.