Hackers are targeting water, food, energy, chemical, manufacturing and commercial facilities by taking aim at Siemens S7 Series programmable logic controllers (PLCs) and making use of artificial intelligence in the attacks, U.S. government agencies warned Wednesday.

It’s the latest government warning about attacks on critical infrastructure as the United States wages war against Iran, which the government blamed for a recent campaign against water and wastewater systems— but doesn’t mention in Wednesday’s alert. 

The National Security Agency didn’t immediately respond to a request for comment about who was behind the attacks on the PLCs, which are used to control manufacturing processes.

The agencies said the attacks were an “active threat,” rather than a theoretical one. The attacks could disrupt critical industrial processes, cause safety incidents or lead to the compromise of sensitive data.

Wednesday’s alert from the NSA, Cybersecurity and Infrastructure Security Agency, FBI, Energy Department and Environmental Protection Agency makes special note of the hackers using AI-generated exploitation scripts in the attacks.

“Using AI to generate exploitation scripts represents an evolution in threat actor capabilities, dramatically reducing the technical expertise and time required to develop working ICS exploitation scripts and malicious tools,” the alert states. “In addition, AI enables adversaries to rapidly leverage additional attack vectors and adapt to defensive measures. Threat actors can easily collect public information about vulnerabilities and weaknesses, find exposed and exploitable PLCs, and use AI-generated scripts to act on that information.”

A former top CISA official, Michael Garcia, thought that it was a first for the agency in one of its cybersecurity advisories (CSAs) about operational technology (OT).

“It is the first alert I have seen where CISA is saying in a CSA that a malicious actor is using AI scripts to target OT systems,” Garcia, now vice president of the cybersecurity practice at Monument Policy Advocacy, said on LinkedIn. But the advisory doesn’t recommend using AI in response, instead focusing on well-known, traditional defensive measures, he added.

Frenos, an OT penetration testing company, found another element of the alert troubling: The method by which the attackers could use the approach beyond Siemens-made PLCs.

“Siemens S7 is the subject here, but the exposure pattern is not brand specific,” Brian Proctor, CEO of the company, said in an email. “An adversary who has mapped your data blocks understands your process. They know what normal looks like, which means they know what an operator would fail to notice.”

The AI-generated scripts are disguised as legitimate monitoring tools, the advisory said of the hackers behind them.

“The actors leverage Internet scanning services to find Internet-exposed PLCs running outdated software or that are otherwise poorly protected,” the advisory reads.

Siemens said it was “aware” of the alert and “is coordinating closely with CISA.”

“This advisory does not describe new vulnerabilities within the S7 Series programmable logic controllers (PLC). Instead, this reflects threat actors employing new techniques to exploit potential misconfigurations,” the company continued, noting a security bulletin it issued last month.

“Siemens will provide updates around this issue to potentially affected customers through our ProductCERT team,” it said. “At this point in time, we have not identified increased attack levels or unknown vulnerabilities in Siemens ICS products.”

Updated 8/20/2026: to include Siemens comment.

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Last week, the FBI and EPA issued a joint alert that should concern anyone who drinks water in America–which is to say, everyone. Since July 27, water and wastewater utilities in at least seven states have reported cyberattacks against internet-facing programmable logic controllers (PLCs), the small industrial computers that run pumps, valves, and treatment equipment. Some of these attacks degraded operations. Utilities reported pressure loss and flooding, several systems reverted to manual control, and one Minnesota community declaring a local state of emergency.

Nothing about these attacks required sophisticated methods. The attackers didn’t use zero-day exploits or novel malware. They found controllers exposed to the public internet, many of them so old that they stopped receiving security patches years ago. They logged in, changed IP addresses and passwords, and locked operators out of their own equipment. In at least one case, they modified the ladder logic controlling industrial equipment. These were not Hollywood-style hacks. The controllers sat exposed and undefended.

If this feels familiar, it should. In late 2023, attackers compromised controllers at water utilities across several states, including the widely reported incident in Aliquippa, Pennsylvania. The federal government issued guidance then, too. One of the crucial differences between then and now is that attackers have grown in ambition. They’ve moved from defacing screens to disrupting operations across dozens of systems at once, exploiting the fact that third-party integrators often deploy the same vulnerable configuration across many small utilities. 

The uncomfortable truth is that this was preventable. The reason it wasn’t stopped is more structural than technical. The United States has roughly 50,000 community water systems. Most are small, publicly funded, and run by operators whose primary job is keeping water safe and flowing. Cybersecurity ranks far below that, if it ranks at all. The devices in question are often a decade or more old and replacing them takes capital these utilities don’t have. Rules governing water cybersecurity remain mostly voluntary. Attackers understand these economics perfectly. We should too, yet these attacks keep happening.

 But inaction is a choice. The defenses that work here cost little and require no exotic technology. The FBI and EPA guidance is sound, and every water and wastewater organization should act on it this week, not later. Here’s how:

• Get controllers off the public internet. No PLC should be reachable from the outside world. Remote access should go through a secure gateway that mediates, monitors, and logs every connection. That includes cellular modems, which are the overlooked entry point in nearly every audit.
• Fix passwords. Default and shared credentials are still the most common way in. Strong, unique passwords are the cheapest security control available.
• Restrict communication between devices. Firewall rules and access control lists should allow only expected communication between known control system devices. Block traffic from hosting providers and other sources that have no business touching a water plant.
• Lock the logic. Keep physical and software key switches in the run position except during authorized updates. This prevents unauthorized changes to configuration and firmware.
• Practice running manually. The utilities that survived these attacks best were the those that switched to manual operations quickly. That skill requires constant practice.
• Verify, don’t assume. Nearly every utility believes its PLCs aren’t internet-exposed, right up until an inventory proves otherwise. You can’t protect what you can’t see. Most operators are surprised by what a complete asset inventory reveals: forgotten modems, integrator-installed remote access, devices nobody knew were still online.

Every attack like this follows the same pattern. Attackers change configurations, reset passwords, and modify project files. Every one of those actions creates a signal on the network before operations degrade. In this most recent case, one victim only noticed ladder logic discrepancies across multiple sites. Catching intrusions shouldn’t depend on a sharp-eyed engineer having a good day. Continuous monitoring of OT environments exists to turn those signals into alerts within minutes instead of days. That difference is the difference between an incident report and a boil-water notice.

Water systems have the least margin for error and, too often, the fewest resources to defend themselves. The FBI and EPA have told us plainly what’s happening and what to do about it. The attackers are betting we won’t follow through. For the third time in three years, they’re testing that bet.

Let’s finally prove them wrong.

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With the World Cup now complete, its biggest cybersecurity story may be what didn’t happen. While no major public cyber disruption has been reported, that shouldn’t be mistaken for a lack of risk. 

In the run-up to the tournament, the FBI’s Internet Crime Complaint Center (IC3) issued a public service announcement warning organizations and fans about fraudulent, spoofed websites impersonating the FIFA event – a reminder that the absence of a headline-grabbing breach doesn’t mean bad actors weren’t trying. In many ways, it’s evidence of the planning, coordination, and resilience required to keep an event of this scale running securely.

A global event like the World Cup depends on far more than what happens inside the stadium. It relies on local governments, venues, transportation systems, telecom providers, payment platforms, hotels, vendors, public safety agencies, and law enforcement, all working together. 

When I worked at the FBI, I saw how fast major events test teamwork across agencies, regions, and businesses. The World Cup offered that test at a scale few events can match.

Successful resilience is built months before kickoff

Successful major-event security depends on what happens long before there is a visible incident: trusted relationships, clear roles, shared intelligence and response plans. Planning becomes even more important when an event is not limited to a single city or venue.

In the past, event security consisted of guards, gates, and stadium perimeters. Those still matter, but they’re only part of the picture. Today, an event this big that brings millions of people together depends on many systems working in concert. No single organization owns the full risk picture, which means resilience depends on how well these groups can share information, coordinate response plans, and keep essential services operating under pressure. This means security can’t be planned around one perimeter. The real perimeter is the full event ecosystem.

Resilience starts much earlier, with planning across organizations that may not normally operate as one team. The real test for major events is whether public- and private-sector partners know their roles before pressure hits. That includes who shares information, who validates threats, who communicates with the public, who has decision-making authority and how quickly partners can act if a system slows down or becomes unavailable.

Major events are only as resilient as the systems behind them

Attackers don’t need to compromise the most visible organization to create disruption. They can look for weaker points across the event ecosystem. A disruption may begin with a vendor, ticketing platform, transportation partner, payment provider, hotel, contractor or communications provider, but the impact can quickly become broader than any one organization.

Sports organizations now operate like large businesses, with ticketing systems, VIP data, sponsors, vendors, media partners, stadium operations, payment systems, and fan engagement platforms. They depend on networks of suppliers and partners, and that creates multiple possible entry points.

Operational technology (OT) deserves more attention than it typically gets in these conversations. A ransomware attack that disrupted stadium operations directly, rather than a ticketing site or a fan-facing app, would be one of the most damaging scenarios organizers could face. OT security has to sit alongside the more visible concerns like payment fraud and spoofed domains, not behind them.

Bad actors don’t let a good crisis go to waste. Fans are often an easy target. Excitement drives a fan to buy a last-minute ticket or check a score on an unknown site. That excitement is exactly what fraudsters count on.

This risk grows over time. As the event gets closer and attracts more eyes, it becomes a richer target. A fake FIFA ticket site is useless to a crook a month after the last game. Groups running these systems must act faster as opening day nears, and share threat intelligence without delay.

Threat intelligence turns planning into proactive defense

The World Cup may be over, but the work isn’t. Cities, governments, and private-sector organizations will continue supporting large-scale public events that depend on complex digital and physical ecosystems. The question isn’t whether another major event will face cyber threats, it’s whether the planning starts early enough.

Organizations involved in future major events should focus on resilience, not just prevention. That means planning for what happens if a critical system slows down, goes offline, or becomes unreliable, and ensuring partners know how to coordinate before an incident occurs.

Every major event forces defenders to prepare for known risks. The harder challenge is anticipating the ones that haven’t emerged yet.

The next major disruption may not come from the attack that organizations spent months preparing for. It could target a new dependency, exploit emerging technology, or capitalize on a moment when public attention is at its highest. That’s why resilience can’t be built around yesterday’s playbook. It has to be informed by continuous threat intelligence, regular coordination across public- and private-sector partners, and the flexibility to adapt as the threat landscape changes.

The World Cup demonstrated what’s possible when that preparation comes together. As cities, governments, and private organizations look ahead to future global events, success won’t be measured solely by the attacks they stop. It will be measured by how effectively they can maintain critical operations, share information, and adapt under pressure when the unexpected happens.

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