CVE-2026-6138 Totolink A7100RU CGI cstecgi.cgi setAccessDeviceCfg os command injection
Remote attackers can execute arbitrary OS commands on Totolink A7100RU routers via the setAccessDeviceCfg CGI handler.
- 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-2026-6138?
CVE-2026-6138 is a critical command injection vulnerability in Totolink A7100RU, published on 13 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A flaw has been found in Totolink A7100RU 7.4cu.2313_b20191024. The impacted element is the function setAccessDeviceCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. This manipulation of the argument mac causes os command injection. The attack can be initiated remotely. The exploit has been published and may be used.
Which versions are affected by CVE-2026-6138?
How do I fix CVE-2026-6138?
No fix has been published for CVE-2026-6138 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-2026-6138 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-6138 exists.
Sources
Also known as GHSA-4gxr-jwfr-c55p.