CVE-2026-2566: Wavlink WL-NU516U1 adm.cgi sub_406194 stack-based overflow

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-16 · updated 2026-06-17
Weakness: CWE-119

Description

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 attack can be launched remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Affected products

Wavlink NU516U1: 130, 260

References

https://github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/firmware_url.md
https://vuldb.com/?ctiid.346173
https://vuldb.com/?id.346173
https://vuldb.com/?submit.751908

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