Norton say this (on my sisters computer) though I use Avira

You may have recently seen some of the extensive news coverage, including statements from the United States Department of Homeland Security, regarding a vulnerability in Java. Rest assured, because you have a Norton security software product installed on your computer, you're protected against the Java bug (CVE-2013-0422), as long as you have not disabled the automatic updates feature.
We also recommend that you apply Oracle's recently released security patch and make sure you are running the most updated version of Java. Thank you for being a valued Norton customer. Sincerely, The Norton Team