I'm not sure there's a difference in practice.
Sure it's not that there are known problems, but security isn't a thing you have or don't have; it's a process. If your process for identifying and fixing security flaws is broken, that's insecure.
Sure it's not that there are known problems, but security isn't a thing you have or don't have; it's a process. If your process for identifying and fixing security flaws is broken, that's insecure.