Researcher says he's got more serious vulnerabilities to unveil.
Google searches find critical infrastructure equipment that could be remotely controlled over the Internet.
Embedded systems that rely on cellular networks and lack authentication and encryption have holes that attackers can easily exploit, researcher says.
Software employed in critical infrastructure systems in the U.S. and other nations carries security bugs that attackers could take advantage of, says the Department of Homeland Security.
Researchers had planned to demonstrate how to break into critical infrastructure systems.
Cybersecurity officials are busy issuing warnings as researchers keep disclosing new holes in software used to manage systems at utilities and other industrial plants.
Federal cybersecurity group issues warnings about tools that could be used to attack critical infrastructure systems like power companies and utilities, following release of exploits.
U.S. government warns critical-infrastructure operators of serious hole in "SCADA" software used in oil and gas; water; electric utilities; and manufacturing plants around world.
There's no proof that a suspected hacking attack on SCADA systems of a Florida-based energy plant actually occurred, according to the operator, NextEra Energy Resources.
Customers advised not to change the default passwords hard-coded into its WinCC Scada product, even though the malware is circulating.