CVE-2025-5902 TOTOLINK T10 POST Request cstecgi.cgi setUpgradeFW buffer overflow

High 8.7 Published 9 Jun 2025 Updated 10 Jun 2025

Remote attackers can trigger a buffer overflow in the firmware upgrade handler to execute arbitrary code on TOTOLINK T10 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-2025-5902?

CVE-2025-5902 is a high-severity memory corruption vulnerability in TOTOLINK T10, published on 9 Jun 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability was found in TOTOLINK T10 4.1.8cu.5207 and classified as critical. This issue affects the function setUpgradeFW of the file /cgi-bin/cstecgi.cgi of the component POST Request Handler. The manipulation of the argument slaveIpList leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.

Weakness: CWE-120, CWE-119

Which versions are affected by CVE-2025-5902?

It affects 1 product.

Products include Totolink T10 Firmware.

How do I fix CVE-2025-5902?

No fix has been published for CVE-2025-5902 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-2025-5902 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-5902 exists.

Sources

Also known as GHSA-6mq6-6457-rccm.