Internet-facing Modbus OT devices with unauthenticated access remain exposed
Target Trend
Summary
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Internet-facing Modbus OT devices remain exposed to unauthenticated access, with a scan finding at least 179 devices and highlighting a broader critical-infrastructure visibility gap. The exposed systems are reachable on port 502 without login controls. That creates a direct route into industrial controllers that can be read from or potentially written to by an attacker.
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Timeline
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10.04.2026 16:30 2 articles · 1mo ago
Public scan finds unauthenticated Modbus OT devices
Initial DisclosureA public scan of Internet-facing operational technology using Modbus found at least 179 devices on port 502 that allowed unauthenticated access after filtering out possible honeypots, including systems tied to a national railway and two national power grids.
Show sources
- Industrial Controllers Still Vulnerable As Conflicts Move to Cyber — www.darkreading.com — 10.04.2026 16:30
- Industrial Controllers Still Vulnerable As Conflicts Move to Cyber — www.darkreading.com — 10.04.2026 16:30