CVE-2025-6185: Leviton AcquiSuite XSS Vulnerability

CVE-2025-6185 Overview

Leviton AcquiSuite and Energy Monitoring Hub devices are susceptible to a cross-site scripting (XSS) vulnerability that allows an attacker to craft a malicious payload in URL parameters. When a user accesses the manipulated URL, the malicious script executes in the client browser, potentially enabling attackers to steal session tokens and gain control over the service. This vulnerability poses significant risks to industrial control systems (ICS) and energy monitoring infrastructure where these devices are deployed.

Critical Impact

Successful exploitation enables attackers to steal authentication session tokens, hijack user sessions, and potentially gain unauthorized control over energy monitoring systems in industrial environments.

Affected Products

• Leviton AcquiSuite
• Leviton Energy Monitoring Hub

Discovery Timeline

• July 18, 2025 - CVE-2025-6185 published to NVD
• July 22, 2025 - Last updated in NVD database

Technical Details for CVE-2025-6185

Vulnerability Analysis

This cross-site scripting vulnerability (CWE-79) exists in the web interface of Leviton AcquiSuite and Energy Monitoring Hub devices. The vulnerability is classified as reflected XSS, where user-supplied input through URL parameters is not properly sanitized before being included in the rendered web page. When an authenticated user clicks on a crafted malicious link, the injected JavaScript code executes within the context of the victim's browser session.

The attack requires network access and user interaction, meaning an attacker must successfully deliver the malicious URL to a victim who then clicks on it while authenticated to the affected device. Given that these devices are typically used in industrial and energy monitoring environments, successful exploitation could have significant operational consequences.

Root Cause

The root cause of this vulnerability is improper neutralization of input during web page generation. Specifically, the web application fails to adequately validate, sanitize, or encode user-controllable input embedded in URL parameters before rendering it in HTML output. This allows attackers to inject arbitrary JavaScript code that the browser interprets as legitimate script content.

Attack Vector

The attack vector is network-based, requiring an attacker to craft a specially formatted URL containing malicious JavaScript in one or more parameters. The attacker then delivers this URL to the victim through phishing emails, malicious websites, or other social engineering techniques. When the victim navigates to the URL while authenticated to the Leviton device, the malicious script executes in their browser context with full access to the session, cookies, and DOM of the energy monitoring interface.

The exploitation flow typically proceeds as follows: the attacker identifies injectable URL parameters in the web interface, crafts a payload designed to exfiltrate session tokens or perform actions on behalf of the user, and then delivers the malicious link to target users who have access to the energy monitoring systems.

Detection Methods for CVE-2025-6185

Indicators of Compromise

• Unusual or suspicious URL patterns in web server access logs containing encoded JavaScript or HTML tags in query parameters
• Unexpected outbound connections from client systems after accessing the Leviton web interface
• Session tokens appearing in external request logs or being transmitted to unauthorized domains
• Abnormal configuration changes in the energy monitoring system that correlate with user access to unfamiliar URLs

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block requests containing XSS payloads in URL parameters
• Monitor HTTP request logs for suspicious patterns including <script>, javascript:, onerror=, onload=, and similar XSS indicators
• Deploy endpoint detection solutions to identify browser-based attacks and unusual script execution
• Review authentication logs for session anomalies that may indicate token theft or session hijacking

Monitoring Recommendations

• Enable detailed logging on Leviton devices and forward logs to a centralized SIEM for analysis
• Implement Content Security Policy (CSP) headers where possible to restrict script execution sources
• Monitor for phishing campaigns targeting users with access to energy monitoring infrastructure
• Establish baseline behavior for user access patterns and alert on deviations

How to Mitigate CVE-2025-6185

Immediate Actions Required

• Consult the CISA ICS Advisory ICSA-25-198-01 for official guidance and remediation steps
• Restrict network access to Leviton AcquiSuite and Energy Monitoring Hub devices to authorized users and networks only
• Educate users with access to these systems about the risks of clicking unknown or suspicious links
• Implement network segmentation to isolate energy monitoring infrastructure from general corporate networks

Patch Information

Organizations should consult Leviton Product Support Resources for firmware updates and security patches addressing this vulnerability. Apply vendor-supplied patches as they become available following proper change management procedures. Until patches are applied, implement the recommended workarounds and network restrictions.

Workarounds

• Deploy a web application firewall or reverse proxy in front of the Leviton devices to filter XSS payloads
• Restrict access to the web management interface to trusted internal networks only, avoiding any internet exposure
• Implement VPN requirements for remote access to energy monitoring systems
• Use browser extensions or policies that help prevent XSS attacks, such as strict CSP enforcement

# Network segmentation example - restrict access to Leviton devices
# Add firewall rules to limit access to management interface (adjust IPs as needed)
iptables -A INPUT -p tcp --dport 80 -s 192.168.10.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 192.168.10.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP