Vulnerability · Published Mar 6, 2026 · Assigned by VulDB

CVE-2026-3613Wavlink WL-NU516U1 login.cgi sub_401A0C stack-based overflow

High 7.2

In plain English

A high-severity stack buffer overflow in WL-NU516U1 from Wavlink. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities).

Severity (CVSS 3.1)7.2High

Exploit odds (30 days)0.8%top 43.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A vulnerability was identified in Wavlink WL-NU516U1 V240425. This vulnerability affects the function sub_401A0C of the file /cgi-bin/login.cgi. Such manipulation of the argument ipaddr leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure.

Affected products (as reported)

Vendor	Product	Versions
Wavlink	WL-NU516U1	V240425

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-349221 | Wavlink WL-NU516U1 login.cgi sub_401A0C stack-based overflow vdb-entry, technical-description
VDB-349221 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
Submit #755341 | Wavlink NU516U1 V240425 Stack-based Buffer Overflow third-party-advisory
https://github.com/Wlz1112/WAVLINK-NU516-V240425/blob/main/ipaddr_Stack%20Buffer%20Overflow.md exploit