CVE-2025-5909 TOTOLINK EX1200T HTTP POST Request formReflashClientTbl buffer overflow

High 8.7 Published 10 Jun 2025 Updated 10 Jun 2025

Remote attackers can trigger a buffer overflow in the HTTP POST handler of TOTOLINK EX1200T devices, 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-2025-5909?

CVE-2025-5909 is a high-severity memory corruption vulnerability in TOTOLINK EX1200T, published on 10 Jun 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability, which was classified as critical, was found in TOTOLINK EX1200T up to 4.1.2cu.5232_B20210713. Affected is an unknown function of the file /boafrm/formReflashClientTbl of the component HTTP POST Request Handler. The manipulation 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-2025-5909?

It affects 1 product.

Products include Totolink Ex1200t Firmware.

How do I fix CVE-2025-5909?

No fix has been published for CVE-2025-5909 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-2025-5909 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-5909 exists.

Sources

Also known as GHSA-64c7-4r62-687q.