It was after Juniper burned a vulnerability in its products used to support NSA and GCHQ spying, and after independent researchers discovered the nature of the back door (archived) that Glen Greenwald, formerly of the Guardian, revealed that this vulnerability was in a stash of disclosures he received more than two years ago from Edward Snowden. Greenwald's reveal came six days after Juniper disclosed the existence of the backdoor and a day after independent researches began presenting serious evidence indicating the backdoor was born in the USA.
The vulnerability depended on the NSA promoted Dual Elliptic Curve Deterministic Random Bit Generator (Dual EC DRBG). Dual EC DRBG was published by the United States National Institute of Standards and Technology in 2007 over objections, and had been included in commercial cryptographic libraries as early as 2004 thanks to the NSA paying for its inclusion. Shortly after the first publications based on Snowden leaks media outlets fingered Dual EC DRBG as part of the NSA's Project Bullrun cryptography subversion program (archived). NIST waited until late April 2014 to recommend against continued use of Dual EC DRGB in a draft revised standard.
That Juniper disclosed the vulnerability this month suggests they were either lazy, forgetful, or complicit in compromising the security of their customers. That Greenwald waited until Juniper disclosed the vulnerability and others pinned it on the NSA before leaking bits of relevant memos means that he was complicit with every use of this vulnerability. Far from being the hero of the Edward Snowden saga, Greenwald is another villain censoring every actual potentially interesting bit until its disclosure is of absolutely no help to anyone.
At this point it ought to be abundantly clear that the continued use of Dual EC DRBG in any application, commercial or open source, is criminal. Still with Dual EC DRBG deployed in the wild for a decade, it is exceedingly likely vulnerabilities related to its use will continue for quite some time. It belongs in the trash bin with md4 and DES. It is further clear that Greenwald will continue to release new information from his Snowden cache only after the rest of the world has independently come to the conclusion of whatever memo he cites next.