This is something I doubt. Zero-day exploits are the kind that software vendors have no awareness of and therefore have no fixes in place (think mimikatz). Fire

This is something I doubt. Zero-day exploits are the kind that software vendors have no awareness of and therefore have no fixes in place (think mimikatz). FireEye is the sort of company who, upon discovering one in the wild, would disclose it to the software vendor to protect their clients. NSA on the other hand has been proven to hoard zero-days--even from US companies.