Siemens Development/Evaluation Kits for PROFINET IO: Allocation of Resources Without Limits or Throttling (CVE-2020-28400)
Published Sources: CVE.org
What is affected, what to do
Affected devices contain a vulnerability that allows an unauthenticated attacker to trigger a denial of service condition. The vulnerability can be triggered if a large amount of DCP reset packets are sent to the device.
The available sources name no fixed version. Check the vendor guidance in the references below.
- Affected
- Siemens SIMATIC CP 1604
eq All Versions >= V2.7..All Versions >= V2.7 - Siemens SIMATIC CP 1616
eq All Versions >= V2.7..All Versions >= V2.7 - Siemens SIMATIC IE/PB-LINK
gte V3..* - Siemens SIMATIC NET DK-16xx PN IO
eq All Versions >= V2.7..All Versions >= V2.7
- Siemens SIMATIC CP 1604
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Metrics
8.7
Priority
XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.
Source: Vendor (CNA), CVSS v4
7.5
CVSS v3
Severity High on the scale from 0 to 10.
Source: CVE.org
1.9 %
EPSS score
Moderate — model estimates 1-10% exploitation likelihood.
Source: FIRST EPSS, percentile 79.2
Show all metrics
- Severity
- High
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- 93.63 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- 8.7 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- 7.5
CVSS v4
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- 8.7
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- 1.9 %
- 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- 79.2
- 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
- CISA assessment (SSVC)
- Exploitation: none known · automatable · Technical impact: partial
- Source: CISA Vulnrichment, as of 13 June 2024
CWE
CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.
Read in glossary- CWE-770
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- High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
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
Affected devices contain a vulnerability that allows an unauthenticated attacker to trigger a denial of service condition. The vulnerability can be triggered if a large amount of DCP reset packets are sent to the device.
Source: NVD (NIST), cvelistv5
Affected products
The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.
| Affected versions | Fixed in | ||
|---|---|---|---|
| Siemens | Development/Evaluation Kits for PROFINET IO: DK Standard Ethernet Controller |
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| Siemens | Development/Evaluation Kits for PROFINET IO: EK-ERTEC 200 |
|
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| Siemens | Development/Evaluation Kits for PROFINET IO: EK-ERTEC 200P |
|
|
| Siemens | RUGGEDCOM RM1224 LTE(4G) EU |
|
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| Siemens | RUGGEDCOM RM1224 LTE(4G) NAM |
|
|
| Siemens | SCALANCE M804PB |
|
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| Siemens | SCALANCE M812-1 ADSL-Router |
|
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| Siemens | SCALANCE M816-1 ADSL-Router |
|
|
| Siemens | SCALANCE M826-2 SHDSL-Router |
|
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| Siemens | SCALANCE M874-2 |
|
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| Siemens | SCALANCE M874-3 |
|
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| Siemens | SCALANCE M874-3 3G-Router (CN) |
|
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| Siemens | SCALANCE M876-3 |
|
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| Siemens | SCALANCE M876-3 (ROK) |
|
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| Siemens | SCALANCE M876-4 |
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| Siemens | SCALANCE M876-4 (EU) |
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| Siemens | SCALANCE M876-4 (NAM) |
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| Siemens | SCALANCE MUM853-1 (A1) |
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| Siemens | SCALANCE MUM853-1 (B1) |
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| Siemens | SCALANCE MUM853-1 (EU) |
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| Siemens | SCALANCE MUM856-1 (A1) |
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| Siemens | SCALANCE MUM856-1 (B1) |
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| Siemens | SCALANCE MUM856-1 (CN) |
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| Siemens | SCALANCE MUM856-1 (EU) |
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| Siemens | SCALANCE MUM856-1 (RoW) |
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| Siemens | SCALANCE S615 EEC LAN-Router |
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| Siemens | SCALANCE S615 LAN-Router |
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| Siemens | SCALANCE W1748-1 M12 |
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| Siemens | SCALANCE W1788-1 M12 |
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| Siemens | SCALANCE W1788-2 EEC M12 |
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| Siemens | SCALANCE W1788-2 M12 |
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| Siemens | SCALANCE W1788-2IA M12 |
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| Siemens | SCALANCE W721-1 RJ45 |
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| Siemens | SCALANCE W722-1 RJ45 |
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| Siemens | SCALANCE W734-1 RJ45 |
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| Siemens | SCALANCE W734-1 RJ45 (USA) |
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| Siemens | SCALANCE W738-1 M12 |
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| Siemens | SCALANCE W748-1 M12 |
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| Siemens | SCALANCE W748-1 RJ45 |
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| Siemens | SCALANCE W761-1 RJ45 |
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| Siemens | SCALANCE W774-1 M12 EEC |
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| Siemens | SCALANCE W774-1 RJ45 |
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| Siemens | SCALANCE W774-1 RJ45 (USA) |
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| Siemens | SCALANCE W778-1 M12 |
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| Siemens | SCALANCE W778-1 M12 EEC |
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| Siemens | SCALANCE W778-1 M12 EEC (USA) |
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| Siemens | SCALANCE W786-1 RJ45 |
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| Siemens | SCALANCE W786-2 RJ45 |
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|
Vendors and products
- Siemens Development/evaluation Kits For Profinet Io: Dk Standard Ethernet Controller
- Siemens Development/evaluation Kits For Profinet Io: Ek-ertec 200
- Siemens Development/evaluation Kits For Profinet Io: Ek-ertec 200p
- Siemens Ruggedcom Rm1224 Firmware
- Siemens Ruggedcom Rm1224 Lte(4g) Eu
- Siemens Ruggedcom Rm1224 Lte(4g) Nam
- Siemens Siemens SCALANCE M-800 Firmware
- Siemens Scalance M804pb
- Siemens Scalance M812-1 Adsl-router
- Siemens Scalance M816-1 Adsl-router
- Siemens Scalance M826-2 Shdsl-router
- Siemens Scalance M874-2
Affected operating systems
| Other | siemens | dk_standard_ethernet_controller_evaluation_kit_firmware | — |
| Other | siemens | ek-ertec_200_evaulation_kit_firmware | — |
| Other | siemens | ek-ertec_200p_evaluation_kit_firmware | — |
| Other | siemens | ruggedcom_rm1224_firmware | — |
| Other | siemens | scalance_m-800_firmware | — |
| Other | siemens | scalance_s615_firmware | — |
| Other | siemens | scalance_w1700_firmware | — |
| Other | siemens | scalance_w700_firmware | — |
| Other | siemens | scalance_x200-4_p_irt_firmware | — |
| Other | siemens | scalance_x201-3p_irt_firmware | — |
| Other | siemens | scalance_x201-3p_irt_pro_firmware | — |
| Other | siemens | scalance_x202-2_irt_firmware | — |
| Other | siemens | scalance_x202-2p_irt_pro_firmware | — |
| Other | siemens | scalance_x204-2_firmware | — |
| Other | siemens | scalance_x204-2fm_firmware | — |
| Other | siemens | scalance_x204-2ld_firmware | — |
| Other | siemens | scalance_x204-2ld_ts_firmware | — |
| Other | siemens | scalance_x204-2ts_firmware | — |
| Other | siemens | scalance_x204_irt_firmware | — |
| Other | siemens | scalance_x204_irt_pro_firmware | — |
| Other | siemens | scalance_x206-1_firmware | — |
| Other | siemens | scalance_x206-1ld_firmware | — |
| Other | siemens | scalance_x208_firmware | — |
| Other | siemens | scalance_x208pro_firmware | — |
Weakness classes (CWE)
CWE-770Allocation of Resources Without Limits or Throttling
Base
The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
Entry at MITRE CWE-770
References & sources
- Siemens ProductCERTproductcert/pdf/ssa-599968.pdfx_refsource_MISC, Patch, Vendor advisory
- us-cert.cisa.govics/advisories/icsa-21-194-03x_refsource_MISC, Third-party advisory, US government resource
- Siemens ProductCERTproductcert/html/ssa-599968.html
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<a href="https://intel.neosec.eu/en/cve/CVE-2020-28400"><img src="https://intel.neosec.eu/badge/cve/CVE-2020-28400.svg?lang=en" alt="CVE-2020-28400 – NEOSEC Intel" height="20"></a>