CVE-2019-13942: Siemens EN100 Ethernet Module With Firmware Variant DNP3 TCP

High severity, CVSS 7.5. EPSS: 1.9% chance of exploitation in the next 30 days.

A vulnerability has been identified in EN100 Ethernet module DNP3 variant (All versions), EN100 Ethernet module IEC 61850 variant (All versions < V4.37), EN100 Ethernet module IEC104 variant (All versions), EN100 Ethernet module Modbus TCP variant (All versions), EN100 Ethernet module PROFINET IO variant (All versions). An unauthorized user could exploit a buffer overflow vulnerability in the webserver. Specially crafted packets sent could cause a Denial-of-Service condition and if certain conditions are met, the affected devices must be restarted manually to fully recover. At the time of advisory publication no public exploitation of this security vulnerability was known.

Affected products

• Siemens EN100 Ethernet Module With Firmware Variant DNP3 TCP: any version
• Siemens EN100 Ethernet Module With Firmware Variant IEC104: any version
• Siemens EN100 Ethernet Module With Firmware Variant Iec 61850: before 4.37 (fixed in 4.37)
• Siemens EN100 Ethernet Module With Firmware Variant Modbus TCP: any version
• Siemens EN100 Ethernet Module With Firmware Variant Profinet Io: any version

Published 2019-12-12. Last modified 2026-06-17.