CVE-2025-67036: Lantronix EDS5000 RCE Vulnerability

CVE-2025-67036 Overview

An authenticated OS command injection vulnerability has been identified in the Lantronix EDS5000 industrial device server version 2.1.0.0R3. The vulnerability exists in the Log Info page functionality, which allows users to view log files by specifying their names. Due to missing sanitization of the file name parameter, an authenticated attacker can inject arbitrary operating system commands that execute with root privileges, potentially leading to complete system compromise.

Critical Impact

Authenticated attackers can achieve remote code execution with root privileges on affected Lantronix EDS5000 devices, enabling full control over industrial device server infrastructure.

Affected Products

• Lantronix EDS5000 version 2.1.0.0R3
• Lantronix EDS5000 industrial device servers with Log Info page functionality

Discovery Timeline

• 2026-03-11 - CVE-2025-67036 published to NVD
• 2026-03-12 - Last updated in NVD database

Technical Details for CVE-2025-67036

Vulnerability Analysis

This vulnerability is classified under CWE-94 (Improper Control of Generation of Code), commonly referred to as code injection. The root issue stems from the web interface's Log Info page, which accepts user-supplied file names without proper input sanitization before passing them to underlying system commands.

When an authenticated user navigates to the Log Info functionality and provides a malicious file name parameter, the application fails to validate or sanitize the input. This allows an attacker to break out of the intended command context and inject arbitrary OS commands. Since the web application runs with elevated privileges, these injected commands execute with root-level access on the underlying Linux-based system.

The network-based attack vector combined with low attack complexity makes this vulnerability particularly concerning for organizations deploying EDS5000 devices in industrial or enterprise environments. While authentication is required, many device servers maintain default or weak credentials, lowering the barrier to exploitation.

Root Cause

The vulnerability originates from insufficient input validation in the Log Info page's file name parameter handling. The application directly incorporates user-supplied input into system shell commands without proper sanitization, escaping, or parameterization. This allows metacharacters and command separators (such as ;, |, &&, or backticks) to be interpreted as command delimiters, enabling command injection attacks.

Attack Vector

The attack is conducted over the network against the device's web management interface. An authenticated attacker can exploit this vulnerability by:

1. Authenticating to the EDS5000 web interface using valid credentials
2. Navigating to the Log Info page functionality
3. Crafting a malicious file name parameter containing OS command injection payloads
4. Submitting the request, causing the injected commands to execute with root privileges

The exploitation mechanism involves injecting shell metacharacters within the file name parameter. For example, an attacker might append a semicolon followed by arbitrary commands to the expected file name value. The underlying system interprets everything after the semicolon as a separate command, executing it with the application's root privileges.

For detailed technical information, refer to the CISA ICS Advisory ICSA-26-069-02.

Detection Methods for CVE-2025-67036

Indicators of Compromise

• Unusual HTTP requests to the Log Info page containing shell metacharacters (;, |, &&, `, $())
• Web server logs showing file name parameters with encoded or suspicious characters
• Unexpected processes spawned by the web server process on EDS5000 devices
• New user accounts, modified configurations, or unauthorized network connections originating from device servers

Detection Strategies

• Monitor web application logs for requests to Log Info endpoints containing command injection patterns
• Deploy web application firewall (WAF) rules to detect and block command injection payloads in HTTP parameters
• Implement network intrusion detection signatures for known command injection attack patterns targeting Lantronix devices
• Review authentication logs for unusual access patterns or credential abuse targeting device management interfaces

Monitoring Recommendations

• Enable comprehensive logging on all Lantronix EDS5000 devices and forward logs to a centralized SIEM
• Configure alerts for root-level command execution originating from web server processes
• Monitor for outbound connections from device servers to unexpected external IP addresses
• Establish baseline behavior for device management interface access and alert on anomalies

How to Mitigate CVE-2025-67036

Immediate Actions Required

• Restrict network access to the EDS5000 web management interface using firewall rules and network segmentation
• Review and rotate all credentials for EDS5000 device accounts, ensuring strong unique passwords
• Audit access logs for evidence of exploitation attempts or unauthorized access
• Consider temporarily disabling the Log Info functionality if operationally feasible until a patch is available

Patch Information

Organizations should monitor Lantronix Security Solutions for official security updates addressing this vulnerability. Additionally, review the CISA ICS Advisory ICSA-26-069-02 for vendor-specific remediation guidance and updated patch information.

Workarounds

• Implement strict network segmentation to isolate EDS5000 devices from general network access
• Deploy a reverse proxy or web application firewall in front of the management interface to filter malicious requests
• Limit authenticated access to only essential administrative personnel with verified operational requirements
• Enable multi-factor authentication for device management access where supported

# Example: Restrict management interface access via iptables
# Allow management access only from trusted admin network
iptables -A INPUT -p tcp --dport 80 -s 10.0.10.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 10.0.10.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP