EUVD-2025-9519

Comprehensive Technical Analysis of EUVD-2025-9519

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-9519 is a command injection flaw in the web interface of certain Moxa devices. This vulnerability allows a remote attacker with web administrator privileges to execute arbitrary system commands through the NTP settings. The severity of this vulnerability is rated with a CVSS base score of 9.2, indicating a critical risk.

CVSS Vector Breakdown:

• AV:N (Network Vector): The vulnerability is exploitable over the network.
• AC:L (Low Complexity): The attack requires low skill or resources.
• AT:N (No Authentication): No authentication is required to exploit the vulnerability.
• PR:H (High Privileges Required): The attacker needs web administrator privileges.
• UI:N (No User Interaction): No user interaction is required.
• VC:H (High Confidentiality Impact): Successful exploitation can lead to high confidentiality impact.
• VI:H (High Integrity Impact): Successful exploitation can lead to high integrity impact.
• VA:H (High Availability Impact): Successful exploitation can lead to high availability impact.
• SC:N (No Scope Change): The vulnerability does not change the security scope.
• SI:N (No Scope Integrity): The vulnerability does not affect the integrity of the security scope.
• SA:H (High Scope Availability): The vulnerability significantly affects the availability within the security scope.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Command Injection: An attacker with web administrator privileges can inject malicious commands through the NTP settings interface.
• Denial of Service (DoS): The injection of commands can lead to an infinite reboot loop, causing a denial of service for downstream systems.

Exploitation Methods:

• Command Injection: The attacker can input specially crafted commands in the NTP settings field, which are then executed by the system.
• Reboot Loop: By injecting commands that force the device to reboot continuously, the attacker can effectively disable the device and its services.

3. Affected Systems and Software Versions

The vulnerability affects multiple Moxa product series and versions:

• EDR-G9010 Series: Versions 1.0 to 3.14
• EDR-G9004 Series: Versions 1.0 to 3.14
• EDR-8010 Series: Versions 1.0 to 3.14
• OnCell G4302-LTE4 Series: Versions 1.0 to 3.14
• EDR-810 Series: Versions 1.0 to 5.12.39
• TN-4900 Series: Versions 1.0 to 3.14
• EDF-G1002-BP Series: Versions 1.0 to 3.14

4. Recommended Mitigation Strategies

Immediate Actions:

• Access Control: Restrict web administrator access to trusted personnel only.
• Network Segmentation: Isolate affected devices from critical networks to limit the impact of potential exploitation.
• Monitoring: Implement continuous monitoring for unusual reboots or service disruptions.

Long-Term Mitigations:

• Patch Management: Apply the latest firmware updates provided by Moxa as soon as they are available.
• Configuration Hardening: Review and harden the configuration of NTP settings and other web interface parameters.
• Intrusion Detection: Deploy intrusion detection systems (IDS) to detect and alert on suspicious activities.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European organizations relying on Moxa devices for critical network services. The potential for denial of service attacks can disrupt essential services, leading to operational downtime and financial losses. The high CVSS score underscores the need for immediate attention and mitigation efforts to protect against potential exploitation.

6. Technical Details for Security Professionals

Detection:

• Log Analysis: Review system logs for unusual command executions or repeated reboots.
• Network Traffic Analysis: Monitor network traffic for anomalous patterns indicative of command injection attempts.

Response:

• Incident Response Plan: Develop and implement an incident response plan tailored to this vulnerability.
• Forensic Analysis: Conduct forensic analysis to identify the source and extent of the attack if exploitation is detected.

Prevention:

• Regular Audits: Conduct regular security audits of network devices and configurations.
• User Training: Provide training to administrators on secure configuration practices and the risks associated with command injection vulnerabilities.

Conclusion:

EUVD-2025-9519 represents a critical vulnerability that requires immediate attention from organizations using the affected Moxa devices. By implementing the recommended mitigation strategies and maintaining vigilant monitoring, organizations can significantly reduce the risk of exploitation and ensure the continuity of their network services.

References:

• Moxa Security Advisory
• CVE ID: CVE-2025-0415