CVE-2025-67039

Critical

Published: 11 March 2026

Published

11 March 2026

Modified

19 March 2026

KEV Added

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Patch

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CVSS Score 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Score 0.0009 25.2th percentile

Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-67039 is a critical-severity Authentication Bypass Using an Alternate Path or Channel (CWE-288) vulnerability in Lantronix Eds3016Ps1Ns Firmware. Its CVSS base score is 9.1 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 25.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and IA-2 (Identification and Authentication (Organizational Users)).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190). What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

AC-3 Access Enforcement good match

prevent

Enforces approved authorizations for logical access, directly preventing authentication bypass via manipulated URLs and authorization headers on management pages.

IA-2 Identification and Authentication (Organizational Users) good match

prevent

Ensures unique identification and authentication of users for management interfaces, mitigating alternate path bypasses that grant unauthorized admin access.

SI-2 Flaw Remediation good match

preventrecover

Remediates the specific firmware flaw causing authentication bypass by identifying, reporting, and applying vendor patches promptly.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

Why these techniques?

Auth bypass on network-exposed management interface directly enables exploitation of public-facing application for unauthorized admin access.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD 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.

Deeper analysisAI

CVE-2025-67039 is an authentication bypass vulnerability in Lantronix EDS3000PS firmware version 3.1.0.0R2. The flaw affects authentication mechanisms on the device's management pages, where attackers can evade login controls by appending a specific suffix to the URL and supplying an Authorization header using "admin" as the username. Published on 2026-03-11, the vulnerability is classified under CWE-288 (Authentication Bypass Using an Alternate Path or Channel) with a CVSS v3.1 base score of 9.1 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N), indicating critical severity due to its network accessibility and high impacts on confidentiality and integrity.

A remote, unauthenticated attacker requires only network access to the affected device to exploit this issue, with low complexity and no need for user interaction. Exploitation grants unauthorized administrative access to the management interface, enabling the attacker to view sensitive configuration data and potentially alter device settings, compromising the confidentiality and integrity of the system without affecting availability.

Advisories including CISA ICSA-26-069-02, along with resources from eds3000ps.com and lantronix.com, provide further details on mitigation strategies and patches for this vulnerability.