CVE-2026-5178 Totolink A3300R cstecgi.cgi setIptvCfg command injection

Medium 5.3 Published 31 Mar 2026 Updated 2 Apr 2026

Remote attackers can execute arbitrary commands on Totolink A3300R routers via the setIptvCfg 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-2026-5178?

CVE-2026-5178 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 security vulnerability has been detected in Totolink A3300R 17.0.0cu.557_b20221024. Affected by this issue is the function setIptvCfg of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument vlanPriLan3 leads to command injection. Remote exploitation of the attack is possible. The exploit has been disclosed publicly and may be used.

Weakness: CWE-77, CWE-74

Which versions are affected by CVE-2026-5178?

It affects 1 product.

Products include Totolink A3300r Firmware.

How do I fix CVE-2026-5178?

No fix has been published for CVE-2026-5178 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-2026-5178 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5178 exists.

All Totolink A3300r Firmware vulnerabilities

Sources

Also known as GHSA-w3qx-79f2-f95x.