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The Environmental Protection Agency (EPA) and the Cybersecurity and Infrastructure Security Agency (CISA) often identify internet-exposed Human Machine Interfaces (HMIs) at water and wastewater systems via web-based search platforms. In the absence of cybersecurity controls, unauthorized remote users can exploit HMIs to view the contents of the device and make unauthorized changes to potentially disrupt the facility’s water and/or wastewater treatment process. EPA and CISA are releasing this fact sheet to provide water and wastewater utilities with recommendations for limiting the exposure of HMIs on the internet and securing them against malicious cyber activity.
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