Find a source for that nsa story besides 'cryptobang' where any troller can pay 1 btc to have some dumb story written.
In fact the crypto code in monero comes from DJB the renowned cryptographer who is as close to a mortal enemy of the NSA as you will ever find.
The story is ridiculous. It's good trollbait though. If anyone cites it we know they are trolling and not doing any actual research.
"It is likely that CN developers deliberately neglected the Bernsteins rationale in order to make the backdoor possible. By inferring malice aforethought on the CN developers part we may as well call them crooks. The vulnerability is exploited by allowing to whoever has the knowledge to recover users private keys thereby de-anonymizing them through ring signature and key image compromisation. "