CVE-2026-5101 Totolink A3300R Parameter cstecgi.cgi setLanCfg command injection

Medium 5.3 Published 29 Mar 2026 Updated 30 Mar 2026

Remote attackers can execute arbitrary commands on Totolink A3300R routers via the lanIp parameter in the setLanCfg function.

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-2026-5101?

CVE-2026-5101 is a medium-severity command injection vulnerability in Totolink A3300r Firmware, published on 29 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability was identified in Totolink A3300R 17.0.0cu.557_b20221024. This affects the function setLanCfg of the file /cgi-bin/cstecgi.cgi of the component Parameter Handler. The manipulation of the argument lanIp leads to command injection. Remote exploitation of the attack is possible. The exploit is publicly available and might be used.

Weakness: CWE-78, CWE-77, CWE-74

Which versions are affected by CVE-2026-5101?

It affects 1 product.

Products include Totolink A3300r Firmware.

How do I fix CVE-2026-5101?

No fix has been published for CVE-2026-5101 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-2026-5101 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5101 exists.

All Totolink A3300r Firmware vulnerabilities

Sources

Also known as GHSA-452m-gc7f-x9g5.