CVE-2026-120240
Received Received - Intake

Command Injection in WAVLINK WN553X1-B Router

Publication date: 2026-11-01

Last updated on: 2026-11-01

Assigner: VulDB

Description
A vulnerability was determined in WAVLINK WN553X1-B V260403_2.0.0. This issue affects the function sub_41A748 of the file /bin/ioos of the component WireGuard CLI Group Handler. Executing a manipulation of the argument group_id/group_name can lead to os command injection. The attack may be performed from remote. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure.

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Meta Information

Published
2026-11-01
Last Modified
2026-11-01
Generated
2026-11-01
AI Q&A
2026-11-01
EPSS Evaluated
N/A
NVD
CVE-2026-120240

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
WAVLINK WN553X1-B V260403_2.0.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-78 The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
CWE-77 The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

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Executive Summary

CVE-2026-120240 is a command injection flaw in WAVLINK WN553X1-B routers running firmware V260403_2.0.0. It allows authenticated attackers to execute arbitrary OS commands with root privileges by manipulating group_id or group_name parameters in WireGuard CLI Group Handler functions. The attack occurs via crafted HTTP POST requests to /protocol.csp with specific parameters.

Detection Guidance

To detect this vulnerability, check if your WAVLINK WN553X1-B router is running firmware version V260403_2.0.0. Monitor network traffic for HTTP POST requests to /protocol.csp with opt=wireguard_cli_group&function=set parameters. Look for suspicious commands in logs or unusual network activity.

Impact Analysis

This vulnerability enables attackers to take full control of the affected router. They can execute any command as root, steal data, install malware, or use the device in botnets. Attackers need a valid session token, which can be obtained using default credentials. Exploitation could lead to network compromise or unauthorized access to connected systems.

Compliance Impact

This vulnerability likely violates compliance requirements for data protection standards like GDPR and HIPAA due to unauthorized access risks. It could lead to data breaches, loss of confidentiality, and failure to maintain secure systems. Organizations using affected devices may face regulatory penalties and reputational damage.

Mitigation Strategies

Immediately update the router firmware to a patched version if available. Disable remote access to the router's web interface. Change the default admin password to a strong, unique one. Block external access to the /protocol.csp endpoint if possible.

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