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Re:Microsoft rescues XP users with emergency browser fix by rbanffy on Thursday May 01, 2014 @08:06PM (#7683416)
> what is the worst thing that can happen?

An operator that plugs in an infected USB drive that injects a virus that will destroy your Uranium enrichment facility? Air gaps are not what they used to be.

Re:Microsoft rescues XP users with emergency browser fix by Crito on Thursday May 01, 2014 @08:44PM (#7683538)
The USB drive was presumably infected on a computer that is or could be up to date though, indicating the strong possibility that even if the CNC machine were or could have been up to date, it would still be vulnerable.