MediumCVE-2018-16563

Siemens Firmware variant: Denial of Service (CVE-2018-16563)

Published 21.03.2019Sources: CVE.org

What is affected, what to do

The available sources name no fixed version. Check the vendor guidance in the references below.

Affected: Siemens Firmware variant IEC 61850 for EN100 Ethernet module eq All versions < V4.35..All versions < V4.35
Siemens Firmware variant MODBUS TCP for EN100 Ethernet module eq All versions..All versions
Siemens Firmware variant DNP3 TCP for EN100 Ethernet module eq All versions..All versions
Siemens Firmware variant IEC104 for EN100 Ethernet module eq All versions..All versions
Siemens Firmware variant Profinet IO for EN100 Ethernet module eq All versions..All versions
Siemens SIPROTEC 5 relays with CPU variants CP300 and CP100 and the respective Ethernet communication modules eq All versions < V7.82..All versions < V7.82
Siemens SIPROTEC 5 relays with CPU variants CP200 and the respective Ethernet communication modules eq All versions < V7.58..All versions < V7.58

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Metrics

5.9

Priority

XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

Source: NVD, CVSS v3

5.9

CVSS v3

Severity Medium on the scale from 0 to 10.

Source: CVE.org

1.2 %

EPSS score

Moderate — model estimates 1-10% exploitation likelihood.

Source: FIRST EPSS, percentile 67.0

Show all metrics

Severity: Medium
Priority (0–325) The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first? Read in glossary: 65.43 Methodology
Exploit maturity An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack. Read in glossary: no public PoC known
XIEM Effective CVSS XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command. Read in glossary: 5.9 Methodology
CVSS v3 CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions. Read in glossary: 5.9
EPSS score The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“. Read in glossary: 1.2 %; Moderate — model estimates 1-10% exploitation likelihood.
EPSS percentile The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking. Read in glossary: 67.0; High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching. Read in glossary: —
Published: 21.03.2019

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2 NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management. Read in glossary: Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
CRA The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates. Read in glossary: From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001 ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security. Read in glossary: Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

Description

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.

Source: cvelistv5, NVD (NIST)

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

Affected products
		Affected versions	Fixed in
Siemens	Firmware variant DNP3 TCP for EN100 Ethernet module	`All versions`	—
Siemens	Firmware variant IEC 61850 for EN100 Ethernet module	`All versions < V4.35`	—
Siemens	Firmware variant IEC104 for EN100 Ethernet module	`All versions`	—
Siemens	Firmware variant MODBUS TCP for EN100 Ethernet module	`All versions`	—
Siemens	Firmware variant Profinet IO for EN100 Ethernet module	`All versions`	—
Siemens	SIPROTEC 5 relays with CPU variants CP200 and the respective Ethernet communication modules	`All versions < V7.58`	—
Siemens	SIPROTEC 5 relays with CPU variants CP300 and CP100 and the respective Ethernet communication modules	`All versions < V7.82`	—

Vendors and products

Affected operating systems

Affected operating systems

Other	siemens	en100_ethernet_module_firmware	—
Other	siemens	en100_ethernet_module_with_firmware_variant_dnp3_tcp	—
Other	siemens	en100_ethernet_module_with_firmware_variant_iec104	—
Other	siemens	en100_ethernet_module_with_firmware_variant_iec_61850	`4.35`
Other	siemens	en100_ethernet_module_with_firmware_variant_modbus_tcp	—
Other	siemens	en100_ethernet_module_with_firmware_variant_profinet_io	—
Other	siemens	siprotec_5_with_cpu_variant_cp100	—
Other	siemens	siprotec_5_with_cpu_variant_cp200	—
Other	siemens	siprotec_5_with_cpu_variant_cp300	—

References & sources

Siemens ProductCERTproductcert/pdf/ssa-104088.pdfx_refsource_CONFIRM

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