CVE-2026-5177 Totolink A3300R cstecgi.cgi setWiFiBasicCfg command injection

Medium 5.3 Published 31 Mar 2026 Updated 31 Mar 2026

Remote attackers can execute arbitrary commands on Totolink A3300R routers via the setWiFiBasicCfg function in cstecgi.cgi.

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-2026-5177?

CVE-2026-5177 is a medium-severity command injection vulnerability in Totolink A3300r Firmware, published on 31 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A weakness has been identified in Totolink A3300R 17.0.0cu.557_b20221024. Affected by this vulnerability is the function setWiFiBasicCfg of the file /cgi-bin/cstecgi.cgi. Executing a manipulation of the argument rxRate can lead to command injection. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks.

Weakness: CWE-77, CWE-74

Which versions are affected by CVE-2026-5177?

It affects 1 product.

Products include Totolink A3300r Firmware.

How do I fix CVE-2026-5177?

No fix has been published for CVE-2026-5177 yet. Limit exposure of the affected software until one is available.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2026-5177 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5177 exists.

All Totolink A3300r Firmware vulnerabilities

Sources

Also known as GHSA-mq3w-44cm-pfv8.