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

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-03-06 · updated 2026-06-17
Weakness: CWE-119

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

Wavlink NU516U1: m16u1_v240425

References

https://github.com/Wlz1112/WAVLINK-NU516-V240425/blob/main/ipaddr_Stack%20Buffer%20Overflow.md
https://vuldb.com/?ctiid.349221
https://vuldb.com/?id.349221
https://vuldb.com/?submit.755341

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