The report of U.S. involvement may lead to an increase in cyberattacks, with other countries stepping up their offensive cybercapabilities, Fagerland said. "It raises the stakes," he said. "That will cause others to think, 'They're doing it, so why shouldn't we?'"

While several other countries may have offensive cybercapabilities, they appear to be "less organized" than the team that put together Stuxnet, he added.