Magento2: magentoCE2.14 register page strange password strength notice

[Boolem]

magentoCE 2.1.4 stranger password strength message in register page

Preconditions

1. ubuntu 14.04, php7, mysql5.6 , magento version ce-2.14

Steps to reproduce

1.I n the register page, input a password likes:Cc-2017010 ,then I see the password strength message shows "Strong".

1. Then,I change the password to 'Cc-20170109',the password strength turn to 'Medium'
   

Expected result

1. The password 'Cc-20170109' strength should be same or more larger than 'Cc-2017010'.

Actual result

1. [Screenshot, logs]
   The password strength of 'Cc-20170109' is 'medium',its strength is lower than password 'Cc-2017010' which is 'strong'.
   Does anyone know how the magento password strength checker work?Is this the bug?
   

[fooman]

The password strength meter is using this project.

My current guess would be that the second password
Cc-2017010
Cc-20170109
gets marked down because it includes a valid way to describe a date (January 9th 2017) whereas the first one is only an incomplete date.

[magento-engcom-team]

@Boolem, thank you for your report.
We've created internal ticket(s) MAGETWO-78400 to track progress on the issue.

[vrann]

@fooman @rogyar thank you for details on this issue. It makes sense to close the issue.