Apache has never had an exploit like this, and never will. Nor will Linux, or the BIND library, or Perl, or any of the other open-source core software of the global Internet. Open-source software, subject to constant peer review, evolves and gets more secure over time. If theory didn't tell us that, the steadily rising rate of Windows cracks and exploits over the last eighteen months would. Cockcroaches breed in the dark.
Crackers thrive on code secrecy.
It's time to let the sunlight in.