The product does not properly synchronize shared data, such as
					static variables across threads, which can lead to undefined behavior and
					unpredictable data changes.Within servlets, shared static variables are not protected from concurrent
						access, but servlets are multithreaded. This is a typical programming
						mistake in J2EE applications, since the multithreading is handled by the
						framework. When a shared variable can be influenced by an attacker, one
						thread could wind up modifying the variable to contain data that is not
						valid for a different thread that is also using the data within the
						variable. Note that this weakness is not unique to servlets.