Here are the latest versions of these important plugins as of:

9-12-2017

Adobe Flash*

27.0.0.130

Adobe Reader 17.012.20098
Java Runtime Engine Version 8, revision 144
Mozilla Firefox 143,672.0.7 (Just kidding... It's 55.0.3)
   

*If you are using Firefox, you will need a separate version of the Flash update in addition to the one for IE.

Beta versions not considered.

Keep the above programs up to date, along with your OS and virus definitions, and you are likelier to be a happy camper.