Buffer overflow in Wavlink Wl-nu516u1
CVE-2026-4861
A weakness has been identified in Wavlink WL-NU516U1 260227. This vulnerability affects the function ftext of the file /cgi-bin/nas.cgi. This manipulation of the argument Content-Length causes stack-based buffer overflow. The attack can be…
Vulnerability class: Buffer Overflow
EPSS: 0.001 (28.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Wavlink Wl-nu516u1 — versions 260227
- Wavlink Wl-nu516u1_firmware — versions m16u1_v260227
Weakness classification (CWE)
References
- VDB-353192 | Wavlink WL-NU516U1 nas.cgi ftext stack-based overflow (technical-description, Third Party Advisory, VDB Entry, vdb-entry)
- VDB-353192 | CTI Indicators (IOB, IOC, IOA) (signature, Permissions Required, permissions-required, VDB Entry)
- Submit #776217 | Wavlink NU516U1 V260227 Stack-based Buffer Overflow (Third Party Advisory, VDB Entry, third-party-advisory)
- cna@vuldb.com (Exploit, Third Party Advisory, exploit)
Frequently asked questions
- What is CVE-2026-4861?
- CVE-2026-4861 is a high-severity vulnerability in Wavlink Wl-nu516u1, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2026-03-26.
- How severe is CVE-2026-4861?
- High severity. CVSS v3 base score is 8.8 out of 10.