Java Zero-Day Vulnerability?

Hello. This morning I recieved an e-mail from Norton called "Security Alert: Infomation on Java Vulnerability". It mentioned that there's a vulnerability in the Java program that Norton can protect against as long as it and Java is updated regularly.

 

The thing is I'm not sure of the condition of Java on our computer. I don't even know if we have it installed properly. Could someone please assist me in finding out if its ok and if I'm in any immediate danger? Thanks.