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.
Published · last modified .
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: 0.109 (95.7th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 95.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.175 · newest: 0.109 · change: -0.066
Affected products
- Wavlink Wl-Nu516u1 — versions 240425
- Wavlink Wl-Nu516u1 Firmware — versions m16u1_v240425
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/jinhao118/cve/blob/main/WAVLINK_1.md (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.