Now MS had .NET platforms available for a long time but they[MS frameworks] seem to be more secure . I am curious but does making frameworks open source make it difficult to control its progress and making them more secure?
Don’t know. For a long time Windows® would have been high up that list, and that has never been open source. They did go on about people using old unpatched software; there was a notorious vulnerability in JDK7, which was fixed I think in 7u3.
According to one theory, open-source projects are less likely to have security exploits, or bugs in general, because there are "many eyes" on the code and people will see the problems and fix them.
However that theory presupposes that (a) problems are easy to see (b) there are in fact many people looking at the code (c) bugs will be repaired quickly and new versions published quickly. This may not apply to Java.
Another quibble with the original question: as I understand it the recent security exploits involve the JIT compiler feature of the JVM. Is that in fact open source?