By using search engines dedicated to scanning all open ports, or scanning the ports themselves, hackers can remotely take control of critical private and public U.S. infrastructure run largely by industrial control systems (ICS) that weren't built with security in mind.

American water and energy providers are particularly vulnerable to cyberattack because their legacy ICSs were designed without security in mind, said the report from Cybernews, which found numerous examples of water and energy supplies that have been left open for tampering.

Unprotected ICS access points mostly include offshore and onshore oil wells, which CISA recently warned about, as well as public and private water distribution and treatment systems that could be accessed by anyone without passwords. "By accessing exposed onshore oil well ICS, we could take control of multiple oil silos and cause damage to U.S. energy supply by silencing alarms, opening and closing discharge gates, adjusting freefall setpoints, and more," the report said.

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