According to a report recently released by the U.S. Office of the Inspector General, it seems that an unauthorized Raspberry Pi is to blame for a hack at the JPL.
Over the past 10 years, JPL has experienced several cybersecurity incidents that have compromised its IT network. For example, in February 2012 the NASA Inspector General testified before Congress about multiple sophisticated attacks on JPL’s network that allowed intruders full access to key JPL systems and sensitive user accounts.
More recently, in April 2018 JPL discovered that an account belonging to an
external user had been compromised and used to access one of its major mission systems.
Looking through the report, it seems that the JPL has quite the history of being targets for hackers, and CalTech holds the blame. Check out the NASA hosted .PDF report here.