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CISA’s ICS exposure-control checklist: cut reachability first
Internet-reachable industrial control systems (ICS) are exposed. CISA advises reducing reachability first, then using firewalls and separating ICS/OT from business networks. Check affected software or firmware versions and follow vendor mitigation or support guidance. For legacy or unpatchable assets, remove Internet access where possible. If remote access is required, use an updated secure VPN; its security depends on the connected devices.
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