What is CVE-2026-2566?

CVE-2026-2566 is a high-severity vulnerability in Wavlink Wl-nu516u1, classified under Stack-based Buffer Overflow. CVSS score: 7.2/10. Published 2026-02-16.

How severe is CVE-2026-2566?

High severity. CVSS v3 base score is 7.2 out of 10.

Buffer overflow in Wavlink Wl-nu516u1

CVE-2026-2566

A security vulnerability has been detected in Wavlink WL-NU516U1 up to 130/260. This affects the function sub_406194 of the file /cgi-bin/adm.cgi. Such manipulation of the argument firmware_url leads to stack-based buffer overflow. The att…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (18.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R.

Affected products

Wavlink Wl-nu516u1 — versions 130, 260

Weakness classification (CWE)

References

VDB-346173 | Wavlink WL-NU516U1 adm.cgi sub_406194 stack-based overflow (vdb-entry, technical-description)
VDB-346173 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
Submit #751908 | Wavlink NU516U1 V251208 Stack-based Buffer Overflow (third-party-advisory)
github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/firmware_url.md (exploit)

Frequently asked questions

What is CVE-2026-2566?: CVE-2026-2566 is a high-severity vulnerability in Wavlink Wl-nu516u1, classified under Stack-based Buffer Overflow. CVSS score: 7.2/10. Published 2026-02-16.
How severe is CVE-2026-2566?: High severity. CVSS v3 base score is 7.2 out of 10.