What is CVE-2026-3704?

CVE-2026-3704 is a medium-severity vulnerability in Wavlink Nu516u1, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.7/10. Published 2026-03-08.

How severe is CVE-2026-3704?

Medium severity. CVSS v3 base score is 4.7 out of 10.

RCE in Wavlink Nu516u1

CVE-2026-3704

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.

Published 2026-03-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.051 (92.4th percentile), scored 2026-11-02.

Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 92.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.053 · newest: 0.051 · change: -0.002

Affected products

Wavlink Nu516u1 — versions 251208
Wavlink Wl-Nu516u1
Wavlink Wl-Nu516u1 Firmware — versions 251208

Weakness classification (CWE)

References

vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/wavlink_DMZ.md (related, Exploit, Third Party Advisory)
github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/wavlink_DMZ.md (Exploit, Third Party Advisory, exploit)
dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-02-27-2fcf6ae-mt7628-squas… (patch, Broken Link)

Frequently asked questions

What is CVE-2026-3704?: CVE-2026-3704 is a medium-severity vulnerability in Wavlink Nu516u1, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.7/10. Published 2026-03-08.
How severe is CVE-2026-3704?: Medium severity. CVSS v3 base score is 4.7 out of 10.