CVE-2026-6015 Tenda AC9 POST Request QuickIndex formQuickIndex stack-based overflow

High 8.7 Published 10 Apr 2026 Updated 14 Apr 2026

Remote attackers can trigger a stack-based buffer overflow in the Tenda AC9 router via a crafted POST request, potentially leading to arbitrary code execution.

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-2026-6015?

CVE-2026-6015 is a high-severity memory corruption vulnerability in Tenda Ac9 Firmware, published on 10 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability has been found in Tenda AC9 15.03.02.13. Impacted is the function formQuickIndex of the file /goform/QuickIndex of the component POST Request Handler. Such manipulation of the argument PPPOEPassword leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.

Weakness: CWE-121, CWE-119

Which versions are affected by CVE-2026-6015?

It affects 1 product.

Products include Tenda Ac9 Firmware.

How do I fix CVE-2026-6015?

No fix has been published for CVE-2026-6015 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-2026-6015 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-6015 exists.

All Tenda Ac9 Firmware vulnerabilities

Sources

Also known as GHSA-9jxj-33wq-5v9p.