CVE-2026-120282
Received Received - Intake

Command Injection in WAVLINK WN536AX6-A Router

Publication date: 2026-11-02

Last updated on: 2026-11-02

Assigner: VulDB

Description
A vulnerability was determined in WAVLINK WN536AX6-A V260507. This impacts the function host_black of the file /protocol.csp. This manipulation of the argument mac causes os command injection. Remote exploitation of the attack is possible. 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
2026-11-02
Last Modified
2026-11-02
Generated
2026-11-02
AI Q&A
2026-11-02
EPSS Evaluated
N/A
NVD
CVE-2026-120282

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
WAVLINK WN536AX6-A V260507

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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.

Attack-Flow Graph

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Executive Summary

This vulnerability is an authenticated command injection flaw in the WAVLINK WN536AX6-A router firmware V260507. It exists in the host_black function of /protocol.csp where the mac parameter is not sanitized before being passed to a shell command. Attackers can exploit this to inject arbitrary commands, leading to remote code execution with root privileges.

Detection Guidance

To detect this vulnerability, check if your WAVLINK WN536AX6-A router uses firmware version V260507. Verify if the host_black handler in /protocol.csp is exposed and if the mac parameter is vulnerable to command injection. Test by sending a crafted request with a payload like mac=aa" | touch /bannet_ax6 # to see if arbitrary commands execute.

Scan your network for devices with open ports exposing /protocol.csp. Use tools like curl to interact with the handler and observe responses for command execution signs.

Impact Analysis

An attacker can exploit this to gain full control of the router, execute arbitrary commands with root privileges, and potentially compromise the entire network. Authentication can be bypassed due to default passwordless login, making exploitation easier.

Mitigation Strategies

Immediately update the router firmware to a patched version if available. Disable default passwordless login by setting FirstLogin=0 and enforce strong authentication. Block external access to the /protocol.csp endpoint via firewall rules.

Monitor network traffic for suspicious requests targeting the mac parameter. Consider isolating the device from critical network segments until mitigation is confirmed.

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