CVE-2025-9303 TOTOLINK A720R cstecgi.cgi setParentalRules buffer overflow

High 8.7 Published 21 Aug 2025 Updated 21 Aug 2025

Remote attackers can trigger a buffer overflow in the TOTOLINK A720R router's parental control feature, 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-2025-9303?

CVE-2025-9303 is a high-severity memory corruption vulnerability in TOTOLINK A720R, published on 21 Aug 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A security flaw has been discovered in TOTOLINK A720R 4.1.5cu.630_B20250509. This issue affects the function setParentalRules of the file /cgi-bin/cstecgi.cgi. Performing manipulation of the argument desc results in buffer overflow. The attack is possible to be carried out remotely. The exploit has been released to the public and may be exploited.

Weakness: CWE-120, CWE-119

Which versions are affected by CVE-2025-9303?

It affects 1 product.

Products include Totolink A720r Firmware.

How do I fix CVE-2025-9303?

No fix has been published for CVE-2025-9303 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-2025-9303 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-9303 exists.

Sources

Also known as GHSA-xr89-g3xx-9x48.