The United States created the Stuxnet cyberworm attack on Iran’s nuclear fuel enrichment facility, says former counterterrorism czar Richard Clarke.

Problem: “thousands of people around the world have it and are playing with it,” he says. “And if I’m right, the best cyberweapon the United States has ever developed, it then gave the world for free.”

What’s more, the U.S. has developed the capability to conduct an offensive cyberwar, but we have virtually no defense against a cyberattack that could bring down our nation’s entire electronic infrastructure, including the power grid, banking and telecommunications, and even our military command system, Clarke says in his book, Cyber War.

In addition, “Every major company in the United States has already been penetrated by China” — including our supply chain of chips, routers and hardware we import from Chinese and other foreign suppliers,” he believes, which could include “weaponized malware” that would result in loss of U.S. military power.