Premier Support for Oracle 12cR2 is slated to end by Nov 2020 and there does not appear to be any intention by Oracle to provide Extended Support beyond this time frame.
Planning to upgrade to Oracle 19c. When does 14.3 plan on supporting Oracle 19c.
Component : CA IDENTITY SUITE (VIRTUAL APPLIANCE)
Oracle 19c is currently supported for both versions 14.2 and 14.3 of the Identity Suite.
Please see the documentation for the Certification Matrix and for Oracle 19c specific requirements in the documentation, for example for Identity Portal 14.3: