CVE-2026-3715 Wavlink WL-WN579X3-C firewall.cgi sub_40139C stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the firewall CGI script to execute arbitrary code on Wavlink routers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-3715?
CVE-2026-3715 is a high-severity memory corruption vulnerability in Wavlink WL-WN579X3-C, published on 8 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was found in Wavlink WL-WN579X3-C 231124. This affects the function sub_40139C of the file /cgi-bin/firewall.cgi. Performing a manipulation of the argument del_flag results in stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been made public and could be used. Upgrading to version 20260226 is able to mitigate this issue. You should 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.
Which versions are affected by CVE-2026-3715?
It affects 1 product.
Products include Wavlink Wl-Wn579x3-C Firmware.
How do I fix CVE-2026-3715?
No fix has been published for CVE-2026-3715 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-3715 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3715 exists.
Other vulnerabilities in Wavlink WL-WN579X3-C
Sources
Also known as GHSA-7hf8-hqfw-77qp.