CVE-2026-31170 Command injection in n/a

Critical 9.8 Published 9 Apr 2026 Updated 14 Apr 2026

Attackers can execute arbitrary commands on ToToLink A3300R routers via the stun-pass parameter in the cstecgi.cgi script.

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-2026-31170?

CVE-2026-31170 is a critical command injection vulnerability in Totolink A3300r Firmware, published on 9 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 stun-pass parameter to /cgi-bin/cstecgi.cgi.

Weakness: CWE-77

Which versions are affected by CVE-2026-31170?

It affects 1 product.

Products include Totolink A3300r Firmware.

How do I fix CVE-2026-31170?

No fix has been published for CVE-2026-31170 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-2026-31170 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-31170 exists.

All Totolink A3300r Firmware vulnerabilities

Sources

Also known as GHSA-cmwm-73hq-3hhx.