On: US Government Fears Another Explosion Of The Ransomware Plague It Helped Create

[qb45]

Projects the size of Windows may easily contain enough "organic" bugs to keep all the NSAs of the world happy without adding anything new.

However, backdooring of security and cryptographic products by the NSA and others is a thing:

https://news.ycombinator.com/item?id=14335730

There is no hard proof that NSA did any of these backdoors, but they clearly do something of this kind, given data in the last link.