CVE-2025-4271 TOTOLINK A720R cstecgi.cgi information disclosure

Medium 6.9 Published 5 May 2025 Updated 5 May 2025

Remote attackers can disclose system logs via the cstecgi.cgi endpoint on TOTOLINK A720R routers, potentially exposing sensitive configuration data.

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-2025-4271?

CVE-2025-4271 is a medium-severity vulnerability in TOTOLINK A720R, published on 5 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability was found in TOTOLINK A720R 4.1.5cu.374. It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument topicurl with the input showSyslog leads to information disclosure. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.

Weakness: CWE-284, CWE-200

Which versions are affected by CVE-2025-4271?

It affects 1 product.

Products include Totolink A720r Firmware.

How do I fix CVE-2025-4271?

No fix has been published for CVE-2025-4271 yet. Limit exposure of the affected software until one is available.

Is CVE-2025-4271 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-4271 exists.

Sources

Also known as GHSA-4xv4-mw36-x4rv.