CISA’s Iran cyber warning was reiterated on July 2, 2025, after the June 2025 U.S. and Israeli strikes on Iran. The underlying joint fact sheet, current as of June 30, urged U.S. critical infrastructure operators and other organizations to prepare for potential Iranian-affiliated cyber activity. It did not report that a coordinated Iran-attributed campaign was underway in the United States.
What CISA warned about—and what it did not
The joint fact sheet from CISA, the FBI, the Department of Defense Cyber Crime Center and the NSA urges vigilance against potential targeted activity by Iranian-affiliated actors. It names U.S. critical infrastructure and other U.S. entities as potential targets, with increased risk for defense industrial base companies—particularly those with holdings or relationships involving Israeli research and defense firms. The agencies’ fact sheet is dated June 30, 2025.
The warning describes risks and possible targeting, not confirmed compromise of every sector or system it mentions. In the July 2 report, Computer Weekly quoted CISA as saying: “At this time, we have not seen indications of a coordinated campaign of malicious cyber activity in the US that can be attributed to Iran.” That statement is explicitly time-bounded and concerns a coordinated campaign attributable to Iran; it is not a claim that no Iran-linked activity existed. Computer Weekly’s July 2 report provides the reiteration and quotation.
Which systems and weaknesses matter
The agencies describe opportunistic targeting of poorly secured networks and internet-connected devices. They call out systems running outdated software with known vulnerabilities, as well as devices and accounts protected by default or commonly used passwords.
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Operational technology and industrial environments
For operational technology (OT), the fact sheet identifies engineering and operator devices, performance and security systems, and vendor or third-party maintenance and monitoring systems as areas to consider. Their inclusion does not mean those systems were reported compromised; it means they belong in an organization’s risk review and defensive planning.
There is relevant earlier context, but it is a separate event: a joint advisory dated December 18, 2024 documented Iranian Revolutionary Guard Corps-affiliated actors exploiting programmable logic controllers (PLCs) in multiple sectors, including U.S. water and wastewater facilities. That historical advisory explains why OT appears in the threat discussion; its findings should not be mistaken for findings from the June 2025 fact sheet. Read the December 2024 joint advisory.
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Disruption, leaks and ransomware
The June fact sheet also discusses defacements, information leaks and a likely increase in distributed denial-of-service (DDoS) activity, as well as possible ransomware collaboration. These are assessed risks, not assurances that any one organization will be attacked or that a particular incident will occur.
What critical infrastructure operators should do
The agencies’ recommendations combine exposure reduction, stronger access controls and recovery preparation. Apply them to the organization’s actual network and OT environment rather than treating them as a product checklist.
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- Review exposed systems. Identify internet-connected devices and services, prioritize software with known vulnerabilities, and update or otherwise mitigate vulnerable systems. Pay particular attention to equipment that is outdated or difficult to patch.
- Remove weak credentials. Replace default and common passwords, and review accounts and devices that can be reached remotely. Consider whether stolen or leaked credentials could be reused to access other systems.
- Strengthen authentication. Use strong access controls, including phishing-resistant multifactor authentication (MFA) where applicable. Confirm that authentication controls cover remote access and relevant vendor or third-party accounts.
- Include OT and service providers in the review. Account for engineering and operator devices, performance and security systems, and vendor maintenance and monitoring connections in the organization’s security posture.
- Rehearse response and recovery. Review and update incident-response plans, then practice the steps needed to contain an incident and restore operations. Plans should account for the systems and dependencies that are essential to the organization.
Why the alert remains a warning, not a prediction
The joint agencies said they were continuing to monitor the situation and would release pertinent cyber threat and defense information as it became available. The fact sheet therefore gives organizations a basis for preparedness while distinguishing potential targeting from confirmed coordinated activity. The July 2, 2025 report and June 30 fact sheet describe that moment; they should not be read as a newly issued October 2026 alert.
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