CVE-2025-5901 TOTOLINK T10 POST Request cstecgi.cgi UploadCustomModule buffer overflow

High 8.7 Published 9 Jun 2025 Updated 10 Jun 2025

Remote attackers can trigger a buffer overflow in the UploadCustomModule function of TOTOLINK T10 routers, 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-2025-5901?

CVE-2025-5901 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 has been found in TOTOLINK T10 4.1.8cu.5207 and classified as critical. This vulnerability affects the function UploadCustomModule of the file /cgi-bin/cstecgi.cgi of the component POST Request Handler. The manipulation of the argument File leads to buffer overflow. The attack can 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-2025-5901?

It affects 1 product.

Products include Totolink T10 Firmware.

How do I fix CVE-2025-5901?

No fix has been published for CVE-2025-5901 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-2025-5901 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-5901 exists.

Sources

Also known as GHSA-jfcx-jqxf-6323.