What’s Vulnerable › Vulnerabilities

CVE-2018-4838

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-03-08 · updated 2026-06-17
• Weakness: CWE-306

Description

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: all versions
• Siemens En100 Ethernet Module Iec 104 Firmware: all versions
• Siemens En100 Ethernet Module Iec 61850 Firmware: before 4.30 — fixed in 4.30
• Siemens En100 Ethernet Module Modbus Tcp Firmware: all versions
• Siemens En100 Ethernet Module Profinet Io Firmware: all versions

How to fix

Upgrade to a fixed version: Siemens En100 Ethernet Module Iec 61850 Firmware 4.30. Check the vendor advisory for mitigations.

References

• https://cert-portal.siemens.com/productcert/pdf/ssa-845879.pdf
• https://www.securityfocus.com/bid/103379
• https://ics-cert.us-cert.gov/advisories/ICSA-18-067-01
• https://cert-portal.siemens.com/productcert/pdf/ssa-845879.pdf
• https://www.securityfocus.com/bid/103379

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