RCE in Wavlink Wl-Nu516u1
CVE-2026-4166
A vulnerability was found in Wavlink WL-NU516U1 240425. The impacted element is the function sub_404F68 of the file /cgi-bin/login.cgi. The manipulation of the argument homepage/hostname results in cross site scripting. The attack can be launched remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (25.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Wavlink Wl-Nu516u1 — versions 240425
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, vdb-entry)
- vuldb.com/ (signature, permissions-required)
- vuldb.com/ (third-party-advisory)
- vuldb.com/ (third-party-advisory)
- github.com/Litengzheng/vul_db/blob/main/WL-NU516U1/vul_14/README.md (related)
- github.com/Litengzheng/vul_db/blob/main/WL-NU516U1/vul_15/README.md (exploit)
Frequently asked questions
- What is CVE-2026-4166?
- CVE-2026-4166 is a low-severity vulnerability in Wavlink Wl-Nu516u1, classified under Cross-site Scripting. CVSS score: 3.5/10. Published 2026-03-16.
- How severe is CVE-2026-4166?
- Low severity. CVSS v3 base score is 3.5 out of 10.