CVE-2025-1852 Totolink EX1800T cstecgi.cgi loginAuth buffer overflow

High 8.7 Published 3 Mar 2025 Updated 3 Mar 2025

Remote attackers can trigger a buffer overflow in the login authentication handler of Totolink EX1800T 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-2025-1852?

CVE-2025-1852 is a high-severity memory corruption vulnerability in Totolink EX1800T, published on 3 Mar 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 EX1800T 9.1.0cu.2112_B20220316 and classified as critical. This vulnerability affects the function loginAuth of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument password 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-2025-1852?

It affects 1 product.

Products include Totolink Ex1800t Firmware.

How do I fix CVE-2025-1852?

No fix has been published for CVE-2025-1852 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-2025-1852 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-1852 exists.

Sources

Also known as GHSA-v35v-mpjj-v438.