CVE-2026-3704 Wavlink NU516U1 Incomplete Fix CVE-2025-10959 firewall.cgi sub_405B2C command injection

Medium 5.1 Published 8 Mar 2026 Updated 10 Mar 2026

Remote attackers can execute arbitrary commands on Wavlink NU516U1 routers via a command injection flaw in the firewall CGI script.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-3704?

CVE-2026-3704 is a medium-severity command injection vulnerability in Wavlink NU516U1, published on 8 Mar 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

A vulnerability has been found in Wavlink NU516U1 251208. This vulnerability affects the function sub_405B2C of the file /cgi-bin/firewall.cgi of the component Incomplete Fix CVE-2025-10959. The manipulation leads to command injection. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. It is recommended to upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Weakness: CWE-77, CWE-74

Which versions are affected by CVE-2026-3704?

It affects 1 product.

Products include Wavlink Wl-Nu516u1 Firmware.

How do I fix CVE-2026-3704?

No fix has been published for CVE-2026-3704 yet. Limit exposure of the affected software until one is available.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2026-3704 being exploited?

There is no known exploitation of CVE-2026-3704 in the wild and no public exploit code.

Sources

Also known as GHSA-v25j-jp29-j537.