Vulnerability · Published Feb 16, 2026 · Assigned by VulDB

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

High 7.2

In plain English

A high-severity stack buffer overflow in WL-NU516U1 from Wavlink. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities).

Severity (CVSS 3.1)7.2High

Exploit odds (30 days)0.5%top 54.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
Wavlink	WL-NU516U1	130260

Weakness: CWE-121, CWE-119 · 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

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
https://github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/firmware_url.md exploit