CVE-2026-31178 Command injection in n/a

Critical 9.8 Published 23 Apr 2026 Updated 23 Apr 2026

Attackers can execute arbitrary commands on ToToLink A3300R routers via the stunMaxAlive parameter 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-2026-31178?

CVE-2026-31178 is a critical command injection vulnerability in Totolink A3300r Firmware, published on 23 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary commands via the stunMaxAlive parameter to /cgi-bin/cstecgi.cgi.

Weakness: CWE-78

Which versions are affected by CVE-2026-31178?

It affects 1 product.

Products include Totolink A3300r Firmware.

How do I fix CVE-2026-31178?

No fix has been published for CVE-2026-31178 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-2026-31178 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-31178 exists.

All Totolink A3300r Firmware vulnerabilities

Sources

Also known as GHSA-4w7w-qm22-5p9j.