Guggenheim Chief Investment Officer Scott Minerd said Friday in an exclusive for CNBC PRO that investors were unprepared for the havoc that a cyber attack on key pieces of financial infrastructure would create. Minerd told CNBC's Brian Sullivan that his top concern for the market was a potential cyberattack on critical parts of the financial system, outweighing worries about the pandemic or government action. "The number one thing, I think, now is the sustainability of the global payments system. In the wake of a number of these cyberattacks, which we've seen many, I think it would be very easy to imagine an attack on the digital payment system," Minerd said, pointing to programs like FedWire and the Depositary Trust Company. Cybersecurity is a growing concern in multiple industries as multiple high-profile attacks have hit U.S. companies over the past year, including hospitals and Colonial Pipeline . President Joe Biden signed an executive order in May aimed at strengthening cybersecurity in the U.S. The risk of hackers taking aim at the financial system is not well appreciated by investors, Minerd said. "I see us as being exceptionally vulnerable in this area right now, and it's not something I'm hearing people talk about, which always kind of makes me think that you are more likely to experience it when people aren't talking about it," Minerd said. "If that happened, I'd think we'd actually have to close the major exchanges for a period of time, and obviously that would lead to a collapse in stock prices." Minerd is not a cybersecurity expert and he said his concern was based on how he felt markets would react and not on particular technical flaw that he was aware of. The Guggenheim investor has made two correct calls on markets this year, predicting a slide in Treasury yields and a sharp fall in bitcoin . His full TV interview on CNBC, along with the exclusive part for CNBC PRO is available to watch above for PRO subscribers.