Obama leaves loophole open for NSA to exploit zero-day vulnerabilities
No, the US White House didn’t know about Heartbleed and didn’t exploit the OpenSSL bug to snoop, it said, but it’s reserving the prerogative to use zero-day exploits as a wedge to pry out intelligence if it serves national security interests. 
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Story added 14. April 2014, content source with full text you can find at link above.