CVE-2024-21833: TP-Link Archer AX3000 RCE Vulnerability

CVE-2024-21833 Overview

CVE-2024-21833 is a command injection vulnerability affecting multiple TP-Link router and mesh networking products. This firmware vulnerability allows a network-adjacent unauthenticated attacker with access to the affected device to execute arbitrary OS commands. The vulnerability is particularly concerning because the affected devices, in their initial configuration, allow login only from the LAN port or Wi-Fi, meaning anyone with local network access could potentially exploit this flaw.

Critical Impact

Unauthenticated attackers on the local network can execute arbitrary OS commands on affected TP-Link routers and mesh systems, potentially leading to complete device compromise, network traffic interception, and lateral movement within the network.

Affected Products

• TP-Link Archer AX3000 (Hardware v1.0) and Firmware
• TP-Link Archer AX5400 (Hardware v1.0) and Firmware
• TP-Link Archer AXE75 (Hardware v1.0) and Firmware
• TP-Link Deco X50 (Hardware v1.0) and Firmware
• TP-Link Deco XE200 (Hardware v1.0) and Firmware

Discovery Timeline

• January 11, 2024 - CVE-2024-21833 published to NVD
• June 16, 2025 - Last updated in NVD database

Technical Details for CVE-2024-21833

Vulnerability Analysis

This vulnerability is classified as CWE-78 (Improper Neutralization of Special Elements used in an OS Command), commonly known as OS Command Injection. The flaw exists in the web management interface firmware of multiple TP-Link consumer routers and mesh networking devices.

The attack requires adjacent network access, meaning the attacker must be connected to the same local network segment as the vulnerable device—either via Ethernet LAN connection or Wi-Fi association. No authentication credentials are required to exploit this vulnerability, and no user interaction is needed, making this a particularly dangerous flaw for home and small business networks.

Successful exploitation grants the attacker the ability to execute arbitrary operating system commands with the privileges of the web server process running on the router's embedded Linux system. This typically provides root-level access to the device, enabling attackers to modify router configurations, intercept network traffic, install persistent backdoors, or use the compromised device as a pivot point for further attacks on the network.

Root Cause

The root cause of CVE-2024-21833 is improper input validation and sanitization in the router's web management interface. User-supplied input is passed directly to system shell commands without adequate filtering or escaping of special characters. This allows attackers to inject shell metacharacters and arbitrary commands that are then executed by the underlying operating system.

The firmware fails to implement proper input sanitization routines that would neutralize dangerous characters such as semicolons (;), pipes (|), backticks (`), and command substitution sequences ($(...)) before incorporating user input into system calls.

Attack Vector

The attack vector is adjacent network-based, requiring the attacker to have network connectivity to the target device. The vulnerability can be exploited through specially crafted HTTP requests sent to the router's web management interface. Since the devices allow access from LAN and Wi-Fi by default, any user connected to the network—including guests on guest networks if they share the same network segment—could potentially exploit this vulnerability.

An attacker would craft malicious input containing OS command injection payloads and submit them through vulnerable parameters in the web interface. The router's firmware would then execute these commands, giving the attacker control over the device.

Detection Methods for CVE-2024-21833

Indicators of Compromise

• Unexpected outbound connections from the router to unknown external IP addresses
• Modified router configuration files or unexpected firmware changes
• Unusual processes running on the router that are not part of standard TP-Link firmware
• Unexplained network traffic patterns or performance degradation
• New or modified cron jobs or startup scripts on the device

Detection Strategies

• Monitor network traffic for unusual HTTP requests to the router's management interface containing shell metacharacters or command injection patterns
• Implement network segmentation to isolate IoT and router management interfaces from untrusted devices
• Deploy network monitoring solutions capable of detecting anomalous traffic patterns from network infrastructure devices
• Review router logs for suspicious authentication attempts or configuration changes

Monitoring Recommendations

• Enable and regularly review router system logs for any suspicious activity
• Configure alerts for any configuration changes made to the router
• Monitor for unexpected DNS queries or outbound connections originating from the router
• Implement network-based intrusion detection to identify command injection attempts

How to Mitigate CVE-2024-21833

Immediate Actions Required

• Update affected TP-Link devices to the latest firmware version immediately
• Restrict access to the router's web management interface to trusted devices only
• Disable remote management features if not required
• Implement strong Wi-Fi passwords to prevent unauthorized network access
• Consider network segmentation to limit exposure of management interfaces

Patch Information

TP-Link has released firmware updates to address this vulnerability. Users should download and apply the latest firmware from the official TP-Link support pages:

• TP-Link Archer AX3000 Firmware
• TP-Link Archer AX5400 Firmware
• TP-Link Archer AXE75 Firmware
• TP-Link Deco X50 Firmware
• TP-Link Deco XE200 Firmware

For additional technical details, refer to the JVN Vulnerability Report.

Workarounds

• Disable the web management interface and use the TP-Link Tether mobile app for management if available
• Configure MAC address filtering to restrict which devices can access the management interface
• Enable access control lists (ACLs) if supported by the device to limit management access
• Physically disconnect untrusted devices from the network until the patch can be applied
• Monitor network for any signs of exploitation while awaiting firmware update deployment

# Network segmentation example using firewall rules
# Block access to router management interface from guest network
iptables -A FORWARD -s 192.168.2.0/24 -d 192.168.1.1 -p tcp --dport 80 -j DROP
iptables -A FORWARD -s 192.168.2.0/24 -d 192.168.1.1 -p tcp --dport 443 -j DROP