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Juan Carlos Munera
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Operational Technology

Your Private APN Is a Flat Network You Never Threat Modeled

·1405 words·7 mins
Operational Technology Threat Intelligence Private APN Cellular Routers Network Segmentation PLC Security Incident Response Asset Inventory
A three month investigation into a December 2025 attack on a Polish combined heat and power plant found something no one had documented before: attackers reaching an operational technology network through a private cellular APN. There was no exploited CVE and no malware. Every destructive step used a supported device function.