What is CVE-2026-3661?

CVE-2026-3661 is a medium-severity vulnerability in Wavlink Wl-Nu516u1, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.7/10. Published 2026-03-07.

How severe is CVE-2026-3661?

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

RCE in Wavlink Wl-Nu516u1

CVE-2026-3661

A flaw has been found in Wavlink WL-NU516U1 240425. This affects the function ota_new_upgrade of the file /cgi-bin/adm.cgi. This manipulation of the argument model causes command injection. It is possible to initiate the attack remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure.

EPSS: 0.145 (96.3th percentile) — read the EPSS interpretation.

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.

Affected products

Wavlink Wl-nu516u1 — versions 240425
Wavlink Wl-nu516u1_firmware — versions m16u1_v240425

Weakness classification (CWE)

References

cna@vuldb.com (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
cna@vuldb.com (signature, Permissions Required, permissions-required, VDB Entry)
cna@vuldb.com (VDB Entry, Third Party Advisory, third-party-advisory)
cna@vuldb.com (Exploit, Third Party Advisory, exploit)

Frequently asked questions

What is CVE-2026-3661?: CVE-2026-3661 is a medium-severity vulnerability in Wavlink Wl-Nu516u1, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.7/10. Published 2026-03-07.
How severe is CVE-2026-3661?: Medium severity. CVSS v3 base score is 4.7 out of 10.