Setting the Statistics

Use a hazard's Stealth and Disable DCs to determine the computer's DCs. Successfully exploiting vulnerabilities with a low DC should reduce the DC to Hack by 1, those with a high DC should reduce it by 2, and those with an elite DC by 3. Penalties to the Hacking DC incurred while exploiting a vulnerability are cumulative and should never be enough to reduce the DC below the low DC. The DC to notice a countermeasure is usually lower than the DC to disable it, which is always high or elite.