# CVE-2025-55081: Potential out of bound read in _nx_secure_tls_process_clienthello()

> An attacker can trigger an out-of-bounds read in the TLS client hello processing, potentially causing a denial of service or information disclosure in ThreadX RTOS.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/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:** 15 Oct 2025
- **Updated:** 15 Oct 2025
- **Also known as:** GHSA-5vrv-8j5h-h6h6

## What is CVE-2025-55081?

CVE-2025-55081 is a medium-severity memory corruption vulnerability in Eclipse Foundation NetX Duo, published on 15 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In Eclipse Foundation NextX Duo before 6.4.4, a module of ThreadX, the _nx_secure_tls_process_clienthello() function was missing length verification of 
certain SSL/TLS client hello message: the ciphersuite length and 
compression method length. In case of an attacker-crafted message with 
values outside of the expected range, it could cause an out-of-bound 
read.

Weakness: CWE-125 (Out-of-bounds Read), CWE-126 (Buffer Over-read)

## Which versions are affected by CVE-2025-55081?

It affects 1 product.


Products: Eclipse Threadx Netx Duo.

## How do I fix CVE-2025-55081?

No fix has been published for CVE-2025-55081 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-55081 being exploited?

There is no known exploitation of CVE-2025-55081 in the wild and no public exploit code.

## Other vulnerabilities in Eclipse Foundation NetX Duo

- [CVE-2025-55085](https://insights.sbomify.com/CVE-2025-55085/): Web http client: Unchecked Server-Side Malicious Packet Issue (high 8.8)
- [CVE-2025-55102](https://insights.sbomify.com/CVE-2025-55102/): Denial of service in Eclipse ThreadX - NetX Duo (high 8.7)
- [CVE-2026-11576](https://insights.sbomify.com/CVE-2026-11576/): Memory corruption in Eclipse ThreadX - NetX Duo (high 7.5)
- [CVE-2025-2260](https://insights.sbomify.com/CVE-2025-2260/): Eclipse ThreadX NetX Duo HTTP component server denial of service (high 7.1)
- [CVE-2025-0726](https://insights.sbomify.com/CVE-2025-0726/): Eclipse ThreadX NetX Duo HTTP server denial of service (high 7.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-55081 and fix it if it is affected.

What it is: CVE-2025-55081 is a medium-severity memory corruption vulnerability in Eclipse Foundation NetX Duo, published on 15 Oct 2025. 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-2025-55081 in the wild and no public exploit code.

Affected product: Eclipse Foundation NetX Duo. 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-2025-55081/ (Markdown: https://insights.sbomify.com/CVE-2025-55081/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-55081
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-55081
- OSV: https://osv.dev/vulnerability/CVE-2025-55081

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-55081/
Summaries are generated and may contain mistakes; the official description above is the record.