What’s Vulnerable › Vulnerabilities

CVE-2018-4840

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% 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 DIGSI 4 (All versions < V4.92), EN100 Ethernet module DNP3 variant (All versions < V1.05.00), EN100 Ethernet module IEC 104 variant (All versions), EN100 Ethernet module IEC 61850 variant (All versions < V4.30), EN100 Ethernet module Modbus TCP variant (All versions), EN100 Ethernet module PROFINET IO variant (All versions). The device engineering mechanism allows an unauthenticated remote user to upload a modified device configuration overwriting access authorization passwords.

Affected products

• Siemens DIGSI 4: before 4.92 — fixed in 4.92
• 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
• Siemens Siprotec 4 7Sj66 Firmware: before 4.30 — fixed in 4.30
• Siemens Siprotec Compact 7Sj80 Firmware: before 4.77 — fixed in 4.77
• Siemens Siprotec Compact 7Sk80 Firmware: before 4.77 — fixed in 4.77

How to fix

Upgrade to a fixed version: Siemens DIGSI 4 4.92; Siemens En100 Ethernet Module Iec 61850 Firmware 4.30; Siemens Siprotec 4 7Sj66 Firmware 4.30; Siemens Siprotec Compact 7Sj80 Firmware 4.77; Siemens Siprotec Compact 7Sk80 Firmware 4.77. Check the vendor advisory for mitigations.

References

• https://cert-portal.siemens.com/productcert/pdf/ssa-203306.pdf
• https://ics-cert.us-cert.gov/advisories/ICSA-18-067-01
• https://cert-portal.siemens.com/productcert/pdf/ssa-203306.pdf

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