CVE-2025-67039 in EDS3000PS
Summary
by MITRE • 03/11/2026
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.
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Analysis
by VulDB Data Team • 09/04/2026
The vulnerability identified as CVE-2025-67039 affects the Lantronix EDS3000PS device firmware version 3.1.0.0R2, representing a critical authentication bypass flaw that undermines the security posture of industrial networking equipment. This issue resides within the management interface of the device, which is commonly used in enterprise and industrial environments for network management and configuration tasks. The vulnerability stems from improper authentication handling within the web-based administration portal, creating a pathway for unauthorized access that could lead to complete system compromise. The flaw specifically manifests when attackers append a particular URL suffix and submit an Authorization header containing the username "admin" without providing a valid password, effectively circumventing the intended authentication mechanism.
The technical exploitation of this vulnerability follows a straightforward pattern that aligns with common web application security flaws classified under CWE-287, which addresses improper authentication issues. The device fails to properly validate authentication tokens or credentials when processing requests to management pages, allowing attackers to bypass the standard authentication flow. This type of vulnerability represents a classic case of weak session management and inadequate access control implementation, where the system does not properly enforce authentication requirements for privileged administrative functions. The specific URL suffix manipulation suggests that the device's web server or application framework has a configuration flaw where certain paths are accessible without proper authentication validation, while the Authorization header manipulation indicates that the system accepts basic authentication credentials without sufficient verification steps.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass potential complete system compromise and network infiltration. An attacker who successfully exploits this vulnerability can gain administrative privileges to configure network settings, modify device parameters, access sensitive data, and potentially use the compromised device as a pivot point for attacking other systems within the network. This risk is particularly concerning in industrial environments where the EDS3000PS devices may be part of critical infrastructure, as unauthorized access could disrupt operations or provide attackers with access to industrial control systems. The vulnerability creates a persistent threat vector that remains active as long as the affected firmware version is deployed, making it a significant concern for organizations that have not yet patched their devices.
Organizations affected by this vulnerability should immediately implement mitigations to protect their network infrastructure. The primary recommended action involves upgrading to the latest firmware version provided by Lantronix that addresses this authentication bypass flaw. Until a firmware update is available, network administrators should implement additional security controls such as restricting access to management interfaces through network segmentation, implementing strict firewall rules that limit access to management ports, and monitoring for suspicious authentication attempts. The mitigation strategy should also include regular security assessments of industrial control systems and network devices to identify similar vulnerabilities. This vulnerability demonstrates the importance of proper authentication implementation and aligns with ATT&CK framework technique T1078 which covers valid accounts and privilege escalation, highlighting how weak authentication mechanisms can be exploited to gain unauthorized access to systems. Organizations should also consider implementing network monitoring solutions that can detect unusual patterns in authentication requests and unauthorized access attempts to management interfaces.