🔎 𝗩𝘂𝗹𝗻𝗲𝗿𝗮𝗯𝗶𝗹𝗶𝘁𝘆 𝗶𝗻 𝗦𝗶𝗲𝗺𝗲𝗻𝘀 𝗦𝗜𝗣𝗥𝗢𝗧𝗘𝗖 𝟱 𝗜𝗱𝗲𝗻𝘁𝗶𝗳𝗶𝗲𝗱
Our Technical Security Audit team has identified a vulnerability in 𝗦𝗶𝗲𝗺𝗲𝗻𝘀 𝗦𝗜𝗣𝗥𝗢𝗧𝗘𝗖 𝟱 𝗱𝗲𝘃𝗶𝗰𝗲𝘀:
⚠️ The USB port may allow attacks due to improper bandwidth limitation.
📌 Description:
Affected SIPROTEC 5 devices do not properly limit the bandwidth for incoming network packets over their local USB port. This could allow an attacker with physical access to send specially crafted packets with high bandwidth to the affected devices thus forcing them to exhaust their memory and stop responding to any network traffic via the local USB port. Affected devices reset themselves automatically after a successful attack. During this restart the protection function is not available.
📄 The full advisory is available here: https://www.gai-netconsult.de/wp-content/uploads/2025/09/Advisory-GAINC-2025-001-1.0.pdf
⚠️ Please follow the manufacturer’s guidance and updates.
🌐 An overview of further advisories can be found on our website: www.gai-netconsult.de/advisories
👏 Congratulations to our colleagues 𝗠𝗮𝗿𝗰 𝗖𝘂𝗻𝘆 and 𝗧𝗼𝗿𝗮𝗹𝗳 𝗚𝗶𝗺𝗽𝗲𝗹 for this discovery.
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