The Data Host would resist with 21 if it had to roll D+F (spoof command, cybercombat), but fine I exaggerated slightly

Still too dicey for a stealth mission at 14-16 dice for the average defense, not to mention Patrol IC rolling 16 dice to spot you and set off an alarm every minute. We were far safer outside the host.
edit: Actually maglocks would be on the security host which would defend with 20 dice against Spoof Command, and that would be the most common use in this adventure, so really I stand by what I said.