Stephen Boyer, co-founder of cybersecurity ratings company BitSight, said it's possible code could be sitting dormant to gather intel on how to launch attacks in the future. And if U.S. nuclear facilities are successfully compromised, it could lead to fires, explosions, or spills of dangerous materials. Plus, as an expert on geopolitical issues framed it, other hackers might be watching what the U.S. tries to secure now, which could tip them off for what to target next.