CVE-2024-39803 Memory corruption in Wavlink AC3000

Critical 9.1 Published 14 Jan 2025 Updated 3 Nov 2025

An authenticated attacker can trigger a stack-based buffer overflow in the qos.cgi component of Wavlink AC3000 routers via a crafted HTTP request.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2024-39803?

CVE-2024-39803 is a critical memory corruption vulnerability in Wavlink Wl-Wn533a8 Firmware, published on 14 Jan 2025. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

Multiple buffer overflow vulnerabilities exist in the qos.cgi qos_settings() functionality of Wavlink AC3000 M33A8.V5030.210505. A specially crafted HTTP request can lead to stack-based buffer overflow. An attacker can make an authenticated HTTP request to trigger these vulnerabilities.A buffer overflow vulnerability exists in the `sel_mode` POST parameter.

Weakness: CWE-120

Which versions are affected by CVE-2024-39803?

It affects 1 product.

Products include Wavlink Wl-Wn533a8 Firmware.

How do I fix CVE-2024-39803?

No fix has been published for CVE-2024-39803 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-2024-39803 being exploited?

There is no known exploitation of CVE-2024-39803 in the wild and no public exploit code.

All Wavlink Wl-Wn533a8 Firmware vulnerabilities

Sources

Also known as GHSA-r9wr-68hr-qxpc.