CVE-2026-13539 Wavlink WL-NU516U1-A POST Parameter wireless.cgi sub_407504 stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the wireless configuration handler 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-2026-13539?
CVE-2026-13539 is a high-severity memory corruption vulnerability in Wavlink WL-NU516U1-A, published on 29 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-13539?
How do I fix CVE-2026-13539?
No fix has been published for CVE-2026-13539 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-2026-13539 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-13539 exists.
Sources
Also known as GHSA-w62x-cjgj-j8jh.