CVE-2026-5176 Totolink A3300R cstecgi.cgi setSyslogCfg command injection

Medium 6.9 Published 31 Mar 2026 Updated 31 Mar 2026

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

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-2026-5176?

CVE-2026-5176 is a medium-severity command injection vulnerability in Totolink A3300r Firmware, published on 31 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A security flaw has been discovered in Totolink A3300R 17.0.0cu.557_b20221024. Affected is the function setSyslogCfg of the file /cgi-bin/cstecgi.cgi. Performing a manipulation of the argument provided results in command injection. The attack may be initiated remotely. The exploit has been released to the public and may be used for attacks.

Weakness: CWE-77, CWE-74

Which versions are affected by CVE-2026-5176?

It affects 1 product.

Products include Totolink A3300r Firmware.

How do I fix CVE-2026-5176?

No fix has been published for CVE-2026-5176 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-2026-5176 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5176 exists.

All Totolink A3300r Firmware vulnerabilities

Sources

Also known as GHSA-j4j2-2vjx-c7hx.