# CVE-2020-28400: Denial of service in Development/Evaluation Kits for PROFINET IO: DK Standard Ethernet Controller

> Unauthenticated attackers can cause denial of service on Siemens industrial network devices by flooding them with DCP reset packets.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Jul 2021
- **Updated:** 14 Apr 2026
- **Also known as:** GHSA-7jh3-xvhx-2q5v

## What is CVE-2020-28400?

CVE-2020-28400 is a high-severity denial of service vulnerability in Siemens Development/Evaluation Kits for PROFINET IO: DK Standard Ethernet Controller, published on 13 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2020-28400?

It affects 79 products.


Products: Siemens Dk Standard Ethernet Controller Evaluation Kit Firmware, Siemens Ek-Ertec 200 Evaulation Kit Firmware, Siemens Ek-Ertec 200p Evaluation Kit Firmware, Siemens Ruggedcom Rm1224 Firmware, Siemens Scalance M-800 Firmware, Siemens Scalance S615 Firmware, Siemens Scalance W1700 Firmware, Siemens Scalance W700 Firmware, Siemens Scalance X200-4 P Irt Firmware, Siemens Scalance X201-3p Irt Firmware, Siemens Scalance X201-3p Irt Pro Firmware, Siemens Scalance X202-2 Irt Firmware, Siemens Scalance X202-2p Irt Pro Firmware, Siemens Scalance X204-2 Firmware, Siemens Scalance X204-2fm Firmware, Siemens Scalance X204-2ld Firmware, Siemens Scalance X204-2ld Ts Firmware, Siemens Scalance X204-2ts Firmware, Siemens Scalance X204 Irt Firmware, Siemens Scalance X204 Irt Pro Firmware and 59 more.

## How do I fix CVE-2020-28400?

No fix has been published for CVE-2020-28400 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-28400 being exploited?

There is no known exploitation of CVE-2020-28400 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-28400 and fix it if it is affected.

What it is: CVE-2020-28400 is a high-severity denial of service vulnerability in Siemens Development/Evaluation Kits for PROFINET IO: DK Standard Ethernet Controller, published on 13 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-28400 in the wild and no public exploit code.

Affected product: Siemens Development/Evaluation Kits for PROFINET IO: DK Standard Ethernet Controller. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2020-28400/ (Markdown: https://insights.sbomify.com/CVE-2020-28400/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-28400
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-28400
- OSV: https://osv.dev/vulnerability/CVE-2020-28400

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-28400/
Summaries are generated and may contain mistakes; the official description above is the record.