An infected company intranet, if embedded systems can be accessed from it;
Vulnerabilities that exist due to the absence of security updates;
Employee removable data-storage devices (including those that have been used for purposes other than embedded systems maintenance);
Hacker-owned removable data-storage devices, if the hackers have unauthorized access to ATM equipment compartments;
Internet sites visited by company personnel during maintenance periods.

Therefore, anti-virus protection that includes a traffic control module and an access restriction module for removable data-storage devices and Internet resources is essential for embedded systems to operate normally.

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