# CVE-2021-43547: TwinOaks Computing CoreDX DDS Secure Network Amplification

> Attackers can cause denial of service and information exposure in TwinOaks CoreDX DDS by sending crafted packets, affecting industrial control systems.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 May 2022
- **Updated:** 16 Apr 2025
- **Also known as:** GHSA-c6m8-cmm6-5qvg

## What is CVE-2021-43547?

CVE-2021-43547 is a high-severity denial of service vulnerability in TwinOaks Computing CoreDX DDS, published on 5 May 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

TwinOaks Computing CoreDX DDS versions prior to 5.9.1 are susceptible to exploitation when an attacker sends a specially crafted packet to flood target devices with unwanted traffic. This may result in a denial-of-service condition and information exposure.

Weakness: CWE-406 (Insufficient Control of Network Message Volume (Network Amplification))

## Which versions are affected by CVE-2021-43547?

It affects 1 product.


Products: Twinoakscomputing Coredx Dds.

## How do I fix CVE-2021-43547?

No fix has been published for CVE-2021-43547 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-43547 being exploited?

There is no known exploitation of CVE-2021-43547 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-43547 and fix it if it is affected.

What it is: CVE-2021-43547 is a high-severity denial of service vulnerability in TwinOaks Computing CoreDX DDS, published on 5 May 2022. 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-2021-43547 in the wild and no public exploit code.

Affected product: TwinOaks Computing CoreDX DDS. 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-2021-43547/ (Markdown: https://insights.sbomify.com/CVE-2021-43547/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-43547
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-43547
- OSV: https://osv.dev/vulnerability/CVE-2021-43547

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-43547/
Summaries are generated and may contain mistakes; the official description above is the record.