Bugs have been discovered in a vulnerable software found on oil rigs, refineries and power plants.
Security researchers discovered the bug, prompting a global push to patch the widely used control system.
If exploited, the bug could give attackers remote access to control systems, and according to the US Department of Homeland Security, an attacker with 'low skill' could exploit the bugs.
The Centum CS 3000 software is used to monitor and control machinery in many large industrial installations.
Julian Diaz, a researcher at security firm Rapid7 said: "If you are able to exploit the vulnerabilities we have identified, you get control of the Human Interface Station. That's where the operator sits or stands and monitors operational details.
"If you have control of that station as an attacker you have the same level of control as someone standing on the plant floor wearing a security badge."
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