from outside, F5 web gui is opening on listner ip

Hi All,

i know its a silly question but before going to customer , just want to check that from outside internet when customer is trying to do an assessment,he is able to open f5 gui on listener ip.

would it be the reason that he has opened 443 and 80 port on that listener ip which is not recommended? Listener ip is only for landing DNS request as an authoritative server right?