ZyXEL P-660HN-T1 V2 Missing Authentication / Password Disclosure

`Description:  
The rpWLANRedirect.asp ASP page is accessible without authentication  
on ZyXEL P-660HN-T1 V2 (2.00(AAKK.3)) devices. After accessing the  
page, the admin user's password can be obtained by viewing the HTML  
source code, and the interface of the modem can be accessed as admin.  
  
Solution:  
The manufacturer has released the hotfix via dropbox for the current  
vulnerability.  
  
https://www.dropbox.com/s/2o8tl9o91mza4em/200AAKK3D0_20190130.zip?dl=0  
  
CVE-2019-6725  
`