CVE-2018-4838: Siemens EN100 Ethernet Module DNP3 Firmware

High severity, CVSS 7.5. EPSS: 1.4% chance of exploitation in the next 30 days.

A vulnerability has been identified in EN100 Ethernet module IEC 61850 variant (All versions < V4.30), EN100 Ethernet module DNP3 variant (All versions < V1.04), EN100 Ethernet module PROFINET IO variant (All versions), EN100 Ethernet module Modbus TCP variant (All versions), EN100 Ethernet module IEC 104 variant (All versions < V1.22). The web interface (TCP/80) of affected devices allows an unauthenticated user to upgrade or downgrade the firmware of the device, including to older versions with known vulnerabilities.

Affected products

• Siemens EN100 Ethernet Module DNP3 Firmware: affected versions not specified
• Siemens EN100 Ethernet Module Iec 104 Firmware: affected versions not specified
• Siemens EN100 Ethernet Module Iec 61850 Firmware: before 4.30 (fixed in 4.30)
• Siemens EN100 Ethernet Module Modbus TCP Firmware: affected versions not specified
• Siemens EN100 Ethernet Module Profinet Io Firmware: affected versions not specified

Published 2018-03-08. Last modified 2026-06-17.