CVE-2018-16563

What it is

A vulnerability has been identified in Firmware variant IEC 61850 for EN100 Ethernet module (All versions < V4.35), Firmware variant MODBUS TCP for EN100 Ethernet module (All versions), Firmware variant DNP3 TCP for EN100 Ethernet module (All versions), Firmware variant IEC104 for EN100 Ethernet module (All versions), Firmware variant Profinet IO for EN100 Ethernet module (All versions), SIPROTEC 5 relays with CPU variants CP300 and CP100 and the respective Ethernet communication modules (All versions < V7.82), SIPROTEC 5 relays with CPU variants CP200 and the respective Ethernet communication modules (All versions < V7.58). Specially crafted packets to port 102/tcp could cause a denial-of-service condition in the affected products. A manual restart is required to recover the EN100 module functionality of the affected devices. Successful exploitation requires an attacker with network access to send multiple packets to the affected products or modules. As a precondition the IEC 61850-MMS communication needs to be activated on the affected products or modules. No user interaction or privileges are required to exploit the vulnerability. The vulnerability could allow causing a Denial-of-Service condition of the network functionality of the device, compromising the availability of the system. At the time of advisory publication no public exploitation of this security vulnerability was known.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

1.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2019-03-21 16:00 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 01:44 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.2% in the next 30 days (EPSS).
• Severity: 5.9 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2019-03-21 16:00 UTC

Last modified

2026-06-17 01:44 UTC

Exploit probability

1.2% · EPSS, next 30 days

Record status

Modified

Affected

• Siemens Siprotec 5 With Cpu Variant cp100 < 7.82
• Siemens Siprotec 5 With Cpu Variant cp200 < 7.58
• Siemens Siprotec 5 With Cpu Variant cp300 < 7.82
• Siemens en100 Ethernet Module Firmware
• Siemens en100 Ethernet Module With Firmware Variant dnp3 Tcp
• Siemens en100 Ethernet Module With Firmware Variant Iec 61850 4.35
• Siemens en100 Ethernet Module With Firmware Variant iec104
• Siemens en100 Ethernet Module With Firmware Variant Modbus Tcp

Attack profile CVSS 3.0 · 5.9

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

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