Censys finds 5,219 devices exposed to attacks by Iranian APTs, majority in U.S.,


Censys finds 5,219 devices exposed to attacks by Iranian APTs, majority in U.S.,

Pierluigi Paganini
April 11, 2026

Censys researchers found 5,219 exposed Rockwell PLCs online, mostly in the U.S., urging defenders to secure or disconnect them.

On April 7, 2026, U.S. agencies, including FBI, CISA, and NSA, warned of Iran-linked APTs exploiting internet-exposed Rockwell Automation PLCs.

Threat actors are carrying out cyberattacks targeting internet-connected operational technology (OT) across multiple critical infrastructure sectors. Iran-linked actors are believed to be behind the activity, aiming to cause disruption in areas such as government services, water systems, and energy.

The attacks involve manipulating project files and altering data shown on HMI and SCADA systems, leading in some cases to operational disruptions and financial losses. Authorities urged organizations to review indicators of compromise and apply mitigations to reduce risks. The campaign has been linked to groups like CyberAv3ngers, associated with Iran’s IRGC.

Organizations are advised to assess exposed devices, follow security guidance from vendors, disconnect systems from the internet where possible, and coordinate with authorities for incident response and mitigation support.

Censys researchers identified 5,219 exposed devices globally, 74.6% in the U.S., many on cellular networks. Analysis of indicators suggests multiple IPs tied to a single compromised engineering workstation, expanding the known attack surface beyond initial disclosures.

“Censys identifies 5,219 internet-exposed hosts globally responding to EtherNet/IP (port 44818) and self-identifying as Rockwell Automation/Allen-Bradley devices.” reads the report published by Censys. “Geographic distribution is heavily skewed toward the United States, which accounts for 74.6% of global exposure — consistent with Rockwell’s dominant market position in North American industrial automation.”

The researchers pointed out that the exposure of Rockwell Automation PLCs extends beyond the U.S., with notable concentrations in Spain, Taiwan, and Italy, while Iceland shows disproportionate exposure. According to Censys, many devices are connected via cellular networks, with providers like Verizon and AT&T accounting for a large share. This indicates field-deployed systems (e.g., utilities and substations) relying on cellular or even satellite links like Starlink, making monitoring and patching difficult.

Most exposed devices belong to MicroLogix and CompactLogix families, often running outdated firmware.

“EtherNet/IP identity responses expose device-level product strings, enabling granular fingerprinting of PLC model and firmware revision without authentication.” continyes the report. “The top 15 product strings are dominated by two families: MicroLogix 1400 (catalog prefix 1766-) and CompactLogix (1769-, 5069-), with one Micro820 (2080-) entry.”

Iran-linked APTs exploiting internet-exposed Rockwell Automation PLCs

Since device details can be identified remotely without authentication, attackers can easily scan, identify, and prioritize vulnerable systems, increasing risks for sectors like energy and water infrastructure.

Censys found that 5,219 exposed Rockwell Automation PLC hosts often run extra services beyond EtherNet/IP, increasing risk. Key exposures include VNC for remote HMI access, Telnet (cleartext legacy access), Modbus for OT communication, and Red Lion Crimson in mixed-vendor setups. These services expand attack paths and raise the risk to industrial systems.

The report also provides Indicators of Compromise (IOCs) and technical details about the operator infrastructure.

Follow me on Twitter: @securityaffairs and Facebook and Mastodon

Pierluigi Paganini

(SecurityAffairs – hacking, Rockwell PLCs)







Source link

Leave a Reply

Subscribe to Our Newsletter

Get our latest articles delivered straight to your inbox. No spam, we promise.

Recent Reviews


Do you ever walk past a person on the streets exhibiting mental health issues and wonder what happened to their family? I have a brother—or at least, I used to. I worry about where he is and hope he is safe. He hasn’t taken my call since 2014.

James and his brother as young children playing together before his brother became sick. James is on the right and his brother is on the left.

James and his brother as young children playing together before his brother became sick. James is on the right and his brother is on the left.

When I was 13, I had a very bad day. I was in the back of the car, and what I remember most was the world-crushing sound violently panging off every surface: he was pounding his fists into the steering wheel, and I worried it would break apart. He was screaming at me and my mother, and I remember the web of saliva and tears hanging over his mouth. His eyes were red, and I knew this day would change everything between us. My brother was sick.

Nearly 20 years later, I still have trouble thinking about him. By the time we realized he was mentally ill, he was no longer a minor. The police brought him to a facility for the standard 72-hour hold, where he was diagnosed with paranoid delusional schizophrenia. Concluding he was not a danger to himself or others, they released him.

There was only one problem: at 18, my brother told the facility he was not related to us and that we were imposters. When they let him out, he refused to come home.

My parents sought help and even arranged for medication, but he didn’t take it. Before long, he disappeared.

My brother’s decline and disappearance had nothing to do with the common narratives about drug use or criminal behavior. He was sick. By the time my family discovered his condition, he was already 18 and legally independent from our custody.

The last time he let me visit, I asked about his bed. I remember seeing his dirty mattress on the floor beside broken glass and garbage. I also asked about the laptop my parents had gifted him just a year earlier. He needed the money, he said—and he had maxed out my parents’ credit card.

In secret from my parents, I gave him all the cash I had saved. I just wanted him to be alright.

My parents and I tried texting and calling him; there was no response except the occasional text every few weeks. But weeks turned into months.

Before long, I was graduating from high school. I begged him to come. When I looked in the bleachers, he was nowhere to be seen. I couldn’t help but wonder what I had done wrong.

The last time I heard from him was over the phone in 2014. I tried to tell him about our parents and how much we all missed him. I asked him to be my brother again, but he cut me off, saying he was never my brother. After a pause, he admitted we could be friends. Making the toughest call of my life, I told him he was my brother—and if he ever remembers that, I’ll be there, ready for him to come back.

I’m now 32 years old. I often wonder how different our lives would have been if he had been diagnosed as a minor and received appropriate care. The laws in place do not help families in my situation.

My brother has no social media, and we suspect he traded his phone several years ago. My family has hired private investigators over the years, who have also worked with local police to try to track him down.

One private investigator’s report indicated an artist befriended my brother many years ago. When my mother tried contacting the artist, they said whatever happened between them was best left in the past and declined to respond. My mom had wanted to wish my brother a happy 30th birthday.

My brother grew up in a safe, middle-class home with two parents. He had no history of drug use or criminal record. He loved collecting vintage basketball cards, eating mint chocolate chip ice cream, and listening to Motown music. To my parents, there was no smoking gun indicating he needed help before it was too late.

The next time you think about a person screaming outside on the street, picture their families. We need policies and services that allow families to locate and support their loved ones living with mental illness, and stronger protections to ensure that individuals leaving facilities can transition into stable care. Current laws, including age-based consent rules, the limits of 72-hour holds, and the lack of step-down or supported housing options, leave too many families without resources when a serious diagnosis occurs.

Governments and lawmakers need to do better for people like my brother. As someone who thinks about him every day, I can tell you the burden is too heavy to carry alone.

James Finney-Conlon is a concerned brother and mental health advocate. He can be reached at [email protected].



Source link