That time the NSA was immediately refuted by Bloomberg: "NSA Said to Exploit Heartbleed Bug for Intelligence for Years"

The U.S. National Security Agency knew for at least two years about a flaw in the way that many websites send sensitive information, now dubbed the Heartbleed bug, and regularly used it to gather critical intelligence, two people familiar with the matter said.

Michael Riley | Bloomberg

Over a 1000 experts at the NSA are devoted to finding flaws like Heartbleed and exploiting them, while leaving U.S. citizens vulnerable to additional exploits from hackers both domestic and abroad, so I think you can be pretty damn sure that even minus Heartbleed, the NSA still has plenty of arrows left in the quiver.