I’ve just had the red screen message (WiFi under attack) - similar old chestnut of few months ago!
Don’t know if an error or more intervention on my part?
my SSID is hidden
Did you recently update the app?
Try making your SSID visible and see if that gets rid of the message.
App auto-updated today (4 hours ago) when it was on charge AND the message appeared when I unplugged it.
I tapped STAY CONNECTED and haven't seen the message since.
If I do, I'll try broadcasting SSID, thanks
Is this linked to KRACK?
Always seems to be a coincidence with Phone warning and some wider security issues.
Though phone has been behaving itself since.
Funnily Android 4.2.2 phone never had any warning after mcAfee update! (think affects newer Android software)