CVE-2026-9477 Totolink A8000RU Web Management cstecgi.cgi setAccessDeviceCfg os command injection
Remote attackers can execute arbitrary OS commands via the mac parameter in the web management interface of Totolink A8000RU 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-2026-9477?
CVE-2026-9477 is a critical command injection vulnerability in Totolink A8000RU, published on 25 May 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 A8000RU 7.1cu.643_b20200521. This issue affects the function setAccessDeviceCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Performing a manipulation of the argument mac results in os command injection. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks.
Which versions are affected by CVE-2026-9477?
How do I fix CVE-2026-9477?
No fix has been published for CVE-2026-9477 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-2026-9477 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-9477 exists.
Sources
Also known as GHSA-v665-872m-c6wh.