Stuxnet, tailored specifically to target Iran’s uranium enrichment operation, struck Iran in 2010 and reportedly dealt a serious blow to its disputed nuclear program.
In its report, NBC referenced a New York Times story published last year that mentioned Cartwright.
The story also said the NSA had developed Stuxnet in tandem with the Israelis.
NBC News, again citing unnamed legal sources, said an original FBI investigation into the Stuxnet leak had focused on a possible White House source. By last year however, agents were honing on on Cartwright, it added.
The US Department of Justice did not immediately respond to a request for comment.