Like those network-attached-torque-wrenches that made the news recently.
Obviously not supposed to be internet facing, but also trivially easy to jailbreak, own, even tamper with values displayed in realtime to the user and the certification server (IE say it is 4nm when it’s actually 1nm).

All of these accomplished using the lamest exploits that were discovered decades ago, and which basic programming practices would prevent.

And considering these were mega pricey and niche, obviously used for things like aerospace etc, absolutely a potential and worthwhile target for sabotage