What’s Vulnerable › Vulnerabilities

CVE-2019-13942

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-12-12 · updated 2026-06-17
• Weakness: CWE-119

Description

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: all versions
• Siemens En100 Ethernet Module With Firmware Variant Iec104: all versions
• 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: all versions
• Siemens En100 Ethernet Module With Firmware Variant Profinet Io: all versions

How to fix

Upgrade to a fixed version: Siemens En100 Ethernet Module With Firmware Variant Iec 61850 4.37. Check the vendor advisory for mitigations.

References

• https://cert-portal.siemens.com/productcert/pdf/ssa-418979.pdf
• https://www.us-cert.gov/ics/advisories/icsa-19-344-07
• https://cert-portal.siemens.com/productcert/pdf/ssa-418979.pdf
• https://www.us-cert.gov/ics/advisories/icsa-19-344-07

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