Executive Summary

CVE-2025-15017 is a high-severity vulnerability in Moxa serial device servers where active debug code remains enabled on the UART interface. An attacker with physical access can connect directly to this interface and gain unauthorized access to internal debug functions without needing authentication, user interaction, or specific execution conditions. This low-complexity exploit allows the attacker to perform privileged operations and access sensitive system resources, severely impacting the confidentiality, integrity, and availability of the affected devices. [1]

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Impact Analysis

This vulnerability can lead to unauthorized access to internal debug functionality of affected Moxa serial device servers, allowing an attacker to execute privileged operations and access sensitive system resources. This results in a high impact on the confidentiality, integrity, and availability of the affected devices. However, no security impact to external or dependent systems has been identified. [1]

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Detection Guidance

Detection of this vulnerability primarily involves physical inspection and verification of device configurations, as the exploit requires physical access to the UART interface. There are no specific network commands provided to detect active debug code on the UART interface remotely. Recommended detection steps include checking for unauthorized physical access to the device, reviewing device logs for unusual activity, and verifying that debug interfaces are disabled according to the Security Hardening Guide for NPort 5000 Series (v2.4 or later). [1]

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Mitigation Strategies

Immediate mitigation steps include applying the firmware updates released by Moxa for all affected product series to disable the active debug code on the UART interface. Additionally, ensure physical security of the devices to prevent unauthorized physical access. Follow the Security Hardening Guide for NPort 5000 Series (v2.4 or later), restrict network access using firewalls and ACLs, implement network segregation, disable unused services, enforce multi-factor authentication and role-based access control, secure remote access with encrypted protocols, enable logging and audit trails, monitor for anomalies, and conduct regular security assessments. [1]

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Compliance Impact

This vulnerability allows unauthorized physical access to sensitive system resources and privileged operations without authentication, which can lead to breaches of confidentiality, integrity, and availability of data. Such breaches can negatively impact compliance with standards and regulations like GDPR and HIPAA that require protection of sensitive data and secure access controls. Therefore, failure to mitigate this vulnerability may result in non-compliance with these regulations. Mitigation includes applying firmware updates, ensuring physical security, and following security best practices to maintain compliance. [1]

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