The problem on the side of closed source software is that if there had been leaks of source code, the vulnerabilities and exploits may remain unknown for long time.
I would go to say that most closed source software code gets leaked. Most companies hold that info close and don't disclose it, even if legally required unless it's made public.
I would go to say that most closed source software code gets leaked. Most companies hold that info close and don't disclose it, even if legally required unless it's made public.