CVE-2026-6155 Totolink A7100RU CGI cstecgi.cgi setWanCfg os command injection
Remote attackers can execute arbitrary OS commands via the pppoeServiceName argument in the setWanCfg function of Totolink A7100RU routers.
- 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-2026-6155?
CVE-2026-6155 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 weakness has been identified in Totolink A7100RU 7.4cu.2313. The impacted element is the function setWanCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Executing a manipulation of the argument pppoeServiceName can lead to os command injection. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks.
Which versions are affected by CVE-2026-6155?
How do I fix CVE-2026-6155?
No fix has been published for CVE-2026-6155 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-2026-6155 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-6155 exists.
Sources
Also known as GHSA-gjg3-p64h-hxrv.