CVE-2026-9436 Totolink A8000RU Web Management cstecgi.cgi setL2tpServerCfg os command injection
Remote attackers can execute arbitrary OS commands via the setL2tpServerCfg function in the Totolink A8000RU web management interface.
- 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-2026-9436?
CVE-2026-9436 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 flaw has been found in Totolink A8000RU 7.1cu.643_b20200521. The impacted element is the function setL2tpServerCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Executing a manipulation of the argument enable can lead to os command injection. The attack can be executed remotely. The exploit has been published and may be used.
Which versions are affected by CVE-2026-9436?
How do I fix CVE-2026-9436?
No fix has been published for CVE-2026-9436 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-2026-9436 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-9436 exists.
Sources
Also known as GHSA-66fw-g229-xchr.