CVE-2025-26339: Q-free Maxtime Auth Bypass Vulnerability

CVE-2025-26339 Overview

CVE-2025-26339 is a critical missing authentication vulnerability (CWE-306) affecting Q-Free MaxTime traffic control systems. The vulnerability exists in the maxtime/handleRoute.lua component and allows unauthenticated remote attackers to access critical system functions without proper authentication. Successful exploitation could compromise device confidentiality, integrity, and availability through crafted HTTP requests.

Critical Impact

Unauthenticated remote attackers can potentially gain complete control over Q-Free MaxTime traffic management devices, affecting critical transportation infrastructure.

Affected Products

• Q-Free MaxTime versions 2.11.0 and earlier
• Traffic control systems utilizing vulnerable MaxTime firmware
• Devices running the vulnerable handleRoute.lua component

Discovery Timeline

• 2025-02-12 - CVE-2025-26339 published to NVD
• 2025-10-24 - Last updated in NVD database

Technical Details for CVE-2025-26339

Vulnerability Analysis

This vulnerability represents a fundamental authentication bypass flaw in Q-Free MaxTime traffic control systems. The maxtime/handleRoute.lua script fails to implement proper authentication checks before processing incoming HTTP requests, allowing unauthenticated users to invoke critical device functions. Traffic control systems like MaxTime are often deployed in critical infrastructure environments, making this vulnerability particularly concerning for transportation safety and operations.

The absence of authentication for critical functions means attackers can interact with the device's management interface without providing valid credentials. This architectural weakness exposes multiple attack surfaces that could be leveraged to manipulate traffic control configurations, extract sensitive operational data, or disrupt service availability.

Root Cause

The root cause of CVE-2025-26339 is a missing authentication check in the handleRoute.lua Lua script within the MaxTime firmware. The code path processes HTTP requests directed at critical device functions without first verifying the identity or authorization of the requester. This represents a CWE-306 vulnerability where the application fails to perform authentication for functions that require a proven identity.

Attack Vector

The attack vector is network-based, requiring no user interaction and no prior authentication. An attacker with network access to a vulnerable Q-Free MaxTime device can send specially crafted HTTP requests to the device's web interface. The requests are processed by the vulnerable handleRoute.lua component, which executes the requested functions without validating whether the requester is authorized. This allows attackers to potentially:

• Access sensitive device configuration and operational data
• Modify traffic control parameters and settings
• Disrupt device availability through malicious commands
• Pivot to other networked systems through the compromised device

For detailed technical information about this vulnerability, refer to the Nozomi Networks Vulnerability Advisory.

Detection Methods for CVE-2025-26339

Indicators of Compromise

• Unexpected HTTP requests to Q-Free MaxTime management interfaces from unauthorized IP addresses
• Anomalous configuration changes to traffic control parameters without corresponding administrator activity
• Authentication bypass patterns in web server logs showing access to protected routes without valid session tokens
• Unusual network traffic patterns targeting the device's HTTP service port

Detection Strategies

• Implement network traffic analysis to identify unauthenticated requests targeting MaxTime device endpoints
• Deploy intrusion detection rules to alert on HTTP requests to sensitive handleRoute.lua functions without proper authentication headers
• Monitor device logs for access attempts to critical management functions
• Utilize behavioral analysis to detect anomalous device configuration changes

Monitoring Recommendations

• Establish baseline network communication patterns for MaxTime devices and alert on deviations
• Configure SIEM rules to correlate unauthenticated HTTP access attempts with device management actions
• Implement real-time monitoring of traffic control device configurations for unauthorized modifications
• Deploy network segmentation monitoring to detect lateral movement attempts from compromised devices

How to Mitigate CVE-2025-26339

Immediate Actions Required

• Isolate vulnerable Q-Free MaxTime devices from untrusted network segments immediately
• Implement network-level access controls (firewalls, ACLs) to restrict access to device management interfaces
• Review device logs for evidence of exploitation or unauthorized access attempts
• Contact Q-Free for guidance on available firmware updates or patches

Patch Information

Organizations should monitor Q-Free communications for security patches addressing CVE-2025-26339. Until a patch is available, network-level mitigations are critical. Consult the Nozomi Networks Vulnerability Advisory for the latest remediation guidance.

Workarounds

• Deploy network firewalls to restrict HTTP access to MaxTime devices to authorized management stations only
• Implement VPN requirements for all remote administration of traffic control infrastructure
• Enable logging and monitoring on all network paths to vulnerable devices
• Consider deploying a web application firewall (WAF) in front of device management interfaces to enforce authentication requirements

Network segmentation is critical for protecting vulnerable traffic control systems. Ensure MaxTime devices are isolated on dedicated management networks:

# Example firewall rule to restrict access to MaxTime device management interface
# Allow only authorized management subnet
iptables -A INPUT -p tcp --dport 80 -s 10.10.10.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 10.10.10.0/24 -j ACCEPT
# Deny all other HTTP/HTTPS access to management interface
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP