CVE-2025-10803 Tenda AC23 HTTP POST Request SetPptpServerCfg sscanf buffer overflow

High 8.7 Published 22 Sep 2025 Updated 22 Sep 2025

Remote attackers can trigger a buffer overflow in the Tenda AC23 router via a crafted HTTP POST request, potentially leading to code execution or service disruption.

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-2025-10803?

CVE-2025-10803 is a high-severity memory corruption vulnerability in Tenda AC23, published on 22 Sep 2025. 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 AC23 up to 16.03.07.52. Affected by this vulnerability is the function sscanf of the file /goform/SetPptpServerCfg of the component HTTP POST Request Handler. Such manipulation of the argument startIp leads to buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.

Weakness: CWE-120, CWE-119

Which versions are affected by CVE-2025-10803?

It affects 1 product.

Products include Tenda Ac23 Firmware.

How do I fix CVE-2025-10803?

No fix has been published for CVE-2025-10803 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-2025-10803 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-10803 exists.

Sources

Also known as GHSA-jxff-p3fh-x5c9.