CVE-2025-5600 TOTOLINK EX1200T cstecgi.cgi setLanguageCfg stack-based overflow

Critical 9.3 Published 4 Jun 2025 Updated 4 Jun 2025

Remote attackers can trigger a stack-based buffer overflow in the setLanguageCfg function to potentially execute arbitrary code on TOTOLINK EX1200T routers.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-5600?

CVE-2025-5600 is a critical memory corruption vulnerability in TOTOLINK EX1200T, published on 4 Jun 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability, which was classified as critical, has been found in TOTOLINK EX1200T 4.1.2cu.5232_B20210713. This issue affects the function setLanguageCfg of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument LangType leads to stack-based buffer overflow. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.

Weakness: CWE-121, CWE-787, CWE-119

Which versions are affected by CVE-2025-5600?

It affects 1 product.

Products include Totolink Ex1200t Firmware.

How do I fix CVE-2025-5600?

No fix has been published for CVE-2025-5600 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-2025-5600 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-5600 exists.

Sources

Also known as GHSA-8gfp-4v63-m7x8.