Infrastructure Briefing — October 3, 2025
CISA ICSA-24-003-07 reports unauthenticated network packets can crash Siemens S7-1500 CPUs until a reboot, underscoring the need to patch firmware and segment control networks.
What happened: CISA's industrial control systems advisory ICSA-24-003-07 states that multiple SIMATIC S7-1500 CPU variants—including safety models—can be sent into a denial-of-service state by crafted packets until firmware is updated and the PLC is power-cycled.ICSA-24-003-07
Why it matters: The affected controllers are widely deployed in manufacturing cells and often paired with GuardLogix safety systems. Unpatched firmware leaves safety functions and production lines exposed to stoppage without physical access to the control network.
Actions for plant operators
- Apply Siemens firmware updates. Patch the specific part numbers listed in the advisory and validate the safety program after upgrading.CISA advisory
- Segment engineering networks. Enforce VLANs and firewall rules so only authorized engineering workstations can reach S7 backplanes; disable unused services in TIA Portal.
- Monitor for resets. Trend unexpected STOP/START events and loss-of-communication alarms in the historian to detect exploitation attempts and trigger incident response.
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