CVE-2025-15519: TP-Link Archer NX RCE Vulnerability

CVE-2025-15519 Overview

CVE-2025-15519 is a command injection vulnerability affecting TP-Link Archer NX series routers. The vulnerability exists due to improper input handling in a modem-management administrative CLI command on affected devices. An authenticated attacker with administrative privileges can inject crafted input that is then executed as part of an operating system command, enabling arbitrary command execution on the underlying operating system.

This vulnerability impacts the confidentiality, integrity, and availability of affected devices. While exploitation requires administrative privileges, successful attacks could allow complete device compromise, enabling attackers to intercept network traffic, modify device configurations, or use the compromised router as a pivot point for further network intrusion.

Critical Impact

Authenticated administrators can execute arbitrary operating system commands on affected TP-Link Archer routers, potentially leading to complete device compromise and network infrastructure breaches.

Affected Products

• TP-Link Archer NX200
• TP-Link Archer NX210
• TP-Link Archer NX500
• TP-Link Archer NX600

Discovery Timeline

• 2026-03-23 - CVE-2025-15519 published to NVD
• 2026-03-24 - Last updated in NVD database

Technical Details for CVE-2025-15519

Vulnerability Analysis

This vulnerability is classified as CWE-78: Improper Neutralization of Special Elements used in an OS Command (OS Command Injection). The flaw exists in the modem-management administrative CLI command processing functionality on TP-Link Archer NX series routers.

The vulnerability requires adjacent network access for exploitation, meaning the attacker must be on the same network segment as the target device. Additionally, administrative privileges are required to access the vulnerable CLI functionality, which limits the attack surface but does not eliminate the risk, particularly in scenarios where administrative credentials have been compromised or where default credentials remain in use.

When exploited successfully, this vulnerability allows an attacker to execute arbitrary commands with the privileges of the router's operating system. This could lead to complete compromise of the device's confidentiality, integrity, and availability, potentially affecting all network traffic passing through the router.

Root Cause

The root cause of CVE-2025-15519 is insufficient input validation and sanitization in the modem-management administrative CLI command handler. User-supplied input is incorporated directly into operating system command strings without proper neutralization of shell metacharacters and special elements. This allows specially crafted input containing command injection payloads to break out of the intended command context and execute arbitrary OS commands.

Attack Vector

The attack requires adjacent network access and administrative authentication to the vulnerable router. An attacker who has obtained administrative credentials—through credential theft, default password exploitation, or other means—can access the modem-management CLI command and supply maliciously crafted input containing shell metacharacters.

The injected commands execute in the context of the router's operating system, typically with elevated privileges. This can enable activities such as firmware modification, configuration exfiltration, network traffic interception, or establishing persistent backdoor access to the device.

Detection Methods for CVE-2025-15519

Indicators of Compromise

• Unusual or unauthorized administrative logins to affected TP-Link Archer NX devices
• Unexpected processes or services running on the router
• Modified firmware or configuration files without authorized changes
• Network traffic anomalies indicating data exfiltration or command-and-control communication from the router
• Presence of unauthorized user accounts or SSH keys on the device

Detection Strategies

• Monitor administrative access logs for unusual login patterns or access from unexpected network locations
• Implement network monitoring to detect anomalous traffic originating from router devices
• Compare current router firmware and configuration against known-good baselines
• Review CLI command history logs (if available) for suspicious modem-management commands containing special characters

Monitoring Recommendations

• Enable comprehensive logging on TP-Link Archer devices and forward logs to a centralized SIEM solution
• Implement network segmentation to limit adjacent network access to router management interfaces
• Deploy network intrusion detection systems (NIDS) to monitor traffic to and from management interfaces
• Establish baseline behavior for router devices and alert on deviations

How to Mitigate CVE-2025-15519

Immediate Actions Required

• Update affected TP-Link Archer NX200, NX210, NX500, and NX600 routers to the latest firmware version available from TP-Link
• Change default administrative credentials immediately if not already done
• Restrict administrative access to trusted hosts and network segments only
• Review administrative access logs for signs of unauthorized access or suspicious activity
• Consider disabling CLI access if not operationally required

Patch Information

TP-Link has released firmware updates addressing this vulnerability for affected Archer NX series devices. Administrators should download and apply the latest firmware from the official TP-Link support pages:

• TP-Link Archer NX200 Firmware
• TP-Link Archer NX210 Firmware
• TP-Link Archer NX500 Firmware
• TP-Link Archer NX600 Firmware

For additional information on device support status, refer to the TP-Link FAQ on Device Support.

Workarounds

• Restrict administrative interface access to specific trusted IP addresses or VLANs
• Implement strong, unique administrative passwords and consider multi-factor authentication if supported
• Disable remote management features and access CLI only from directly connected management workstations
• Place router management interfaces on isolated management networks not accessible from general user networks
• Monitor administrative sessions and implement session timeouts

# Network segmentation example using firewall rules to restrict management access
# Restrict access to router management interface (adjust IP ranges as needed)
iptables -A INPUT -p tcp --dport 22 -s 192.168.1.100/32 -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -j DROP
iptables -A INPUT -p tcp --dport 443 -s 192.168.1.100/32 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP