BSecurity researchers have voiced their concerns in the two weeks since the proposed rules were made public that the U.S. rules definition of intrusion software is too broad, and legitimate vulnerability research and proof-of-concept development will come under regulation. – See more at: https://threatpost.com/bug-bounties-in-crosshairs-of-proposed-us-wassenaar-rules/113204#sthash.cL00eTWJ.dpuf

Source: Wassenaar, Bug Bounties and Vulnerability Rewards Programs | Threatpost | The first stop for security news

Not only that, but using vague terminology means that the US could basically force almost anything they want to have to be cleared through the government before being able to export it.