# CVE-2025-67039: Lantronix EDS3000PS Authentication Bypass Using an Alternate Path or Channel

> Attackers can bypass authentication on Lantronix EDS3000PS management pages by manipulating URL suffixes and headers, gaining unauthorized administrative access.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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:** 11 Mar 2026
- **Updated:** 4 Sep 2026
- **Also known as:** CVE-2025-67048, GHSA-cfv5-944v-wgjm

## What is CVE-2025-67039?

CVE-2025-67039 is a critical authentication bypass vulnerability in Lantronix EDS3000PS series, published on 11 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in Lantronix EDS3000PS 3.1.0.0R2. The authentication on management pages can be bypassed by appending a specific suffix to the URL and by sending an Authorization header that uses "admin" as the username.

Weakness: CWE-288 (Authentication Bypass Using an Alternate Path or Channel)

## Which versions are affected by CVE-2025-67039?

It affects 2 products.


Products: Lantronix Eds3008ps1ns Firmware, Lantronix Eds3016ps1ns Firmware.

## How do I fix CVE-2025-67039?

No fix has been published for CVE-2025-67039 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-67039 being exploited?

There is no known exploitation of CVE-2025-67039 in the wild and no public exploit code.

## Other vulnerabilities in Lantronix EDS3000PS series

- [CVE-2025-67041](https://insights.sbomify.com/CVE-2025-67041/): Lantronix EDS3000PS OS Command Injection (high 8.6)
- [CVE-2025-70082](https://insights.sbomify.com/CVE-2025-70082/): Lantronix EDS3000PS Unverified Password Change (medium 5.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-67039 and fix it if it is affected.

What it is: CVE-2025-67039 is a critical authentication bypass vulnerability in Lantronix EDS3000PS series, published on 11 Mar 2026. 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-2025-67039 in the wild and no public exploit code.

Affected product: Lantronix EDS3000PS series. 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-2025-67039/ (Markdown: https://insights.sbomify.com/CVE-2025-67039/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-67039
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-67039
- OSV: https://osv.dev/vulnerability/CVE-2025-67039

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-67039/
Summaries are generated and may contain mistakes; the official description above is the record.