Hackers Killed a Polish Power Plant Turbine by Tunnelling Through a Wind Farm
A Polish combined heat and power plant lost a steam turbine and its water treatment system in December 2025 after attackers found an unexpected bridge between two entirely separate facilities. CERT Polska disclosed the incident on August 8 after three months of investigation.
The entry point was not the plant itself. It was a wind farm next door — or rather, the FortiGate firewall and VPN concentrator protecting the wind farm's network. That device was internet-facing and allowed accounts to connect without multi-factor authentication. Once inside, the attacker had administrative access to every network segment the VPN could reach.
Here is where it gets novel. The wind farm and the CHP plant shared a private APN (a dedicated cellular data network, think of it as a private mobile broadband lane reserved for grid equipment). That APN was configured to allow any device on the network to talk to any other device — no barriers. The attacker used that open lane to pivot from the compromised wind farm into the power plant's OT (operational technology, the systems that physically control industrial equipment) environment. A WAGO controller inside the plant still had its factory-default admin credentials set, and that was all it took to reach the turbine controls.
CERT Polska calls this the first confirmed real-world attack delivered through a private APN. Investigators found no exploitable software vulnerability to blame — the path in was entirely made of bad configurations, default passwords, and missing access controls working exactly as set up.
The plant serves roughly 50,000 residents. Recovery began that morning while the attackers were still inside, and customers lost no heat or power.
What you should do: If your organisation connects remote equipment over a private cellular APN, treat that network as untrusted, enable client isolation so devices cannot communicate freely with one another, change every default credential on internet-reachable hardware, and require multi-factor authentication on any VPN that touches operational systems.
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