Unlikely but possible. Without knowing more details about the architecture and associated safeguards we really can't do more than speculate.
I disagree. I consider pre-emptively isolating the Stark VCU's 4G communication system from the outside world an action, rather than speculation. And having seen a powerful 4G jammer shut down every cell phone in the main concourse of GCS in NYC - many of which no longer worked when the jammer was shut off - I definitely intend to protect my Stark when I get it.