Two of the issues are DoS issues, which aren't "drop everything, upgrade now." If you don't trust your admins, the fourth issue is very important, but lots of

Two of the issues are DoS issues, which aren't "drop everything, upgrade now." If you don't trust your admins, the fourth issue is very important, but lots of places put complete trust in them. The first issue is more about not becoming a vector for a phishing attack, AIUI.