Suspected Iranian cyberattack on key US infrastructure probed by security agency

"A U.S. water treatment facility has been breached by hackers, according to the Cybersecurity & Infrastructure Security Agency (CISA).

The hackers breached the facility by exploiting the poor default security measures of Unitronic programmable logic controllers (PLCs).
The PLCs were confirmed as the source of the breach by CISA, but the agency stated that the hackers had not affected the water within the facility. A similar attack, attributed to Iranian hackers, took place targeting a water facility in Philadelphia, however CISA did not confirm who was behind the most recent attack." MS