Lantronix Device Installer

Posted on Thursday May 22, 2025

1. EXECUTIVE SUMMARY

CVSS v4 6.9
ATTENTION: Low attack complexity
Vendor: Lantronix
Equipment: Device Installer
Vulnerability: Improper Restriction of XML External Entity Reference

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an attacker to gain access to the host machine running the Device Installer software.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following Lantronix products are affected:

Device Installer: Versions 4.4.0.7 and prior

3.2 VULNERABILITY OVERVIEW

3.2.1 IMPROPER RESTRICTION OF XML EXTERNAL ENTITY REFERENCE CWE-611

Lantronix Device installer is vulnerable to XML External Entity (XXE) attacks in configuration files read from the network device. An attacker could obtain credentials, access these network devices, and modify their configurations. An attacker may also gain access to the host running the Device Installer software or the password hash of the user running the application.

CVE-2025-4338 has been assigned to this vulnerability. A CVSS v3.1 base score of 6.8 has been calculated; the CVSS vector string is (AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:L).

A CVSS v4 score has also been calculated for CVE-2025-4338. A base score of 6.9 has been calculated; the CVSS vector string is (AV:A/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N).

3.3 BACKGROUND

CRITICAL INFRASTRUCTURE SECTORS: Information Technology
COUNTRIES/AREAS DEPLOYED: Worldwide
COMPANY HEADQUARTERS LOCATION: United States

3.4 RESEARCHER

Robert McLellan reported this vulnerability to CISA.

4. MITIGATIONS

Lantronix indicates its Device Installer product has reached its end of support lifecycle in 2018. It will not receive any additional updates or security enhancements. For your security, Lantronix advises migrating to a supported solution Lantronix Provisioning Manager as soon as possible. Using unsupported software is at user's own discretion and may leave user systems vulnerable to security issues.

CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability such as:

Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.
Locate control system networks and remote devices behind firewalls and isolating them from business networks.
When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.

CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.

Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.

Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.

CISA also recommends users take the following measures to protect themselves from social engineering attacks:

Do not click web links or open attachments in unsolicited email messages.
Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.

No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time. This vulnerability is not exploitable remotely.