The ranges are [broken link removed]. In summary, the lower the score the higher the risk you represent, and vice versa.
The ICB credit score models are developed by CRIF (hence the name) and over the years have been updated to reflect changing market conditions (see this press release). The original CRIF model was released in 2001, CRIF 2 in 2007, CRIF 3 in 2012 and CRIF 4 in 2017.
An ICB member/financial institution may obtain the credit score produced by either model, not necessarily the latest.