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Mon 28 Apr 2026 · 06:00● Brief ready
OT Cyber · Top story
CISA warns of active exploitation targeting Modbus-enabled RTUs in water and energy sectors
Why it matters to you
If your RTUs are network-connected and Modbus is exposed — even internally — this is directly relevant. Immediate network segmentation recommended.
CISA Advisory AA26-115A · 2 hours ago
Quick hits
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IEC 61511-1 amendment clarifies SIL verification for legacy systems
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Mon 28 Apr 2026 · 06:00Your daily signal
Top story · OT Cyber
CISA warns of active exploitation targeting Modbus-enabled RTUs across water and energy sectors
Threat actors are actively scanning for exposed Modbus TCP port 502 on RTUs across critical infrastructure.
Why it matters to you
If your RTUs are network-connected and Modbus is exposed — even internally — this is directly relevant. CISA recommends immediate network segmentation and firewall review.
Source: CISA Advisory AA26-115A
Quick hits
Rockwell FactoryTalk: critical auth bypass · CVSS 8.8 · Update immediately
IEC 61511-1 amendment clarifies SIL verification for brownfield SIS upgrades
Siemens PCS 7 v10.1 ships with hardened OPC UA security
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