Command Injection in TP-Link Archer VX1800v

Executive Summary

CVE-2026-15427 is an OS command injection vulnerability in the TR-069 (CWMP) management interface of the TP-Link Archer VX1800v router.

This flaw occurs due to insufficient input validation and sanitization of parameters in the TR-069 interface. Attackers can exploit this by crafting malicious input that gets executed as system-level commands.

Exploitation requires specific conditions, such as TR-069 being enabled and the ability to influence ACS-delivered commands or compromise an ACS server.

If successfully exploited, this vulnerability allows arbitrary command execution with root privileges, leading to a complete compromise of the device.

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Detection Guidance

Detecting this vulnerability on your network or system involves checking for specific conditions and configurations that could indicate exposure to CVE-2026-15427.

• Verify if the TR-069 (CWMP) management interface is enabled on the Archer VX1800v device. This is a prerequisite for exploitation.
• Check the firmware version of the Archer VX1800v. The vulnerability affects versions below V1 0.16.0 2.0.0 v6092.0 Build 260521 RC.7927n. You can typically find the firmware version in the device's web interface under system or status settings.
• Monitor network traffic for unusual or unexpected TR-069 communication, especially interactions with an ACS (Auto Configuration Server). Tools like Wireshark can be used to capture and analyze traffic on port 7547 (commonly used for TR-069).
• Look for signs of unauthorized access or unusual activity on the ACS server, as compromise of the ACS server is one of the exploitation vectors.

Example commands or steps to check for these conditions:

• To check if TR-069 is enabled via the device's web interface: Log in to the router's admin panel, navigate to the TR-069 or CWMP settings, and verify if it is enabled.
• To check the firmware version: Log in to the router's admin panel, navigate to the system or status page, and look for the firmware version information.
• To monitor TR-069 traffic using Wireshark: Capture traffic on the network interface connected to the router and apply a filter for port 7547 (e.g., tcp.port == 7547).

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Impact Analysis

This vulnerability can have severe impacts if exploited.

• Complete device compromise: An attacker could gain root-level access to your TP-Link Archer VX1800v router, allowing them to control the device entirely.
• Network infiltration: With control over the router, an attacker could monitor, intercept, or manipulate network traffic, potentially accessing sensitive data transmitted over your network.
• Malware deployment: The attacker could install malware or backdoors on the router, enabling persistent access even after firmware updates or password changes.
• Lateral movement: The compromised router could serve as a launchpad for attacks on other devices connected to your network, such as computers, smartphones, or IoT devices.
• Service disruption: The attacker could disrupt internet connectivity or degrade network performance, causing downtime or instability.

Exploitation requires TR-069 to be enabled and the ability to influence ACS-delivered commands, which may limit the risk in some environments.

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Compliance Impact

This vulnerability can impact compliance with several common standards and regulations, depending on the context in which the affected device is used.

• GDPR (General Data Protection Regulation): If the compromised router is part of a network handling personal data of EU citizens, a successful exploit could lead to unauthorized access or exposure of this data. This may result in violations of GDPR's data protection and security requirements, potentially leading to fines or legal action.
• HIPAA (Health Insurance Portability and Accountability Act): In healthcare environments, if the router is used to transmit or store protected health information (PHI), exploitation of this vulnerability could lead to unauthorized access to PHI. This would violate HIPAA's Security Rule, which mandates safeguards for electronic PHI.
• PCI DSS (Payment Card Industry Data Security Standard): If the router is part of a network processing payment card data, a compromise could lead to unauthorized access to cardholder data. This would violate PCI DSS requirements for securing cardholder data environments.
• NIST and ISO/IEC 27001: These frameworks emphasize the importance of securing network devices and protecting against unauthorized access. Exploitation of this vulnerability could indicate a failure to implement adequate security controls, potentially leading to non-compliance with these standards.

Organizations using the affected device should assess their risk exposure and take mitigating actions, such as updating the firmware, to maintain compliance with relevant regulations and standards.

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Mitigation Strategies

To mitigate CVE-2026-15427, follow these immediate steps:

• Update the firmware of the Archer VX1800v to the latest version. TP-Link recommends upgrading to firmware version V1 0.16.0 2.0.0 v6092.0 Build 260521 RC.7927n or later to address this vulnerability. Firmware updates can be downloaded from the official TP-Link support page.
• Disable the TR-069 (CWMP) management interface if it is not required for your network operations. This can be done through the device's web interface under the TR-069 or CWMP settings.
• Restrict access to the TR-069 interface by configuring firewall rules to allow connections only from trusted ACS servers. Block unauthorized or unexpected TR-069 traffic on port 7547.
• Monitor the ACS server for signs of compromise or unauthorized access. Ensure the ACS server is secured with strong authentication and access controls.
• Review and audit logs for any suspicious activity related to TR-069 or the device's management interface.
• Follow TP-Link's recommended upgrade procedures, such as using a wired connection and avoiding power interruptions during the firmware update process.

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