Modbus attacks & scanning (port 502)
ICS/OT control protocol — unauthenticated register reads and control writes.
Observed by OffSeq honeypot sensors · last 7 days · #22 most-attacked service · last seen 15 minutes ago
1,765
Attacks
328
Distinct source IPs
502
Port · tcp
The #22 most-attacked service across the fleet in the last 7 days.
OffSeq honeypots emulating Modbus recorded 1,765 attacks from 328 distinct source IPs over the last 7 days. ICS/OT control protocol — unauthenticated register reads and control writes.
Top CVEs exploited across the fleet (last 7 days)
Fleet-wide, not scoped to Modbus.
- CVE-2019-0708501
- CVE-2021-26855479
- CVE-2024-4577479
- CVE-2017-9841401
- CVE-2017-0144252
- CVE-2025-324890