WAVLINK-SA-2026-062902: Stack-based Buffer Overflow in WL-NU516U1-A
Abstract
A vulnerability was identified in Wavlink WL-NU516U1-A M16U1_V240425. The impacted element is the function sub_407504 of the file /cgi-bin/wireless.cgi of the component POST Parameter Handler. Such manipulation of the argument Guest_ssid leads to stack-based buffer overflow. The attack can be executed remotely. The exploit is publicly available and might be used. It is suggested to upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
Affected Products
| Product | Affected Firmware | Fixed Firmware | Availability |
|---|---|---|---|
| WL-NU516U1-A Wi-Fi Router | M16U1_V251208 and earlier |
M16U1_V260713 |
Available now · Download |
Detail
A vulnerability was identified in Wavlink WL-NU516U1-A M16U1_V240425. The impacted element is the function sub_407504 of the file /cgi-bin/wireless.cgi of the component POST Parameter Handler. Such manipulation of the argument Guest_ssid leads to stack-based buffer overflow. The attack can be executed remotely. The exploit is publicly available and might be used. It is suggested to upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product. Tracked as CVE-2026-13539 · CVSS v3.1 8.8 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Solution
Update the firmware to version M16U1_V260713 or later.
Acknowledgement
Thanks to Svigo-o for reporting this vulnerability.
Reference
CVE-2026-13539 · NVD entry