CVE-2026-7140 Totolink A8000RU CGI cstecgi.cgi CsteSystem os command injection
Remote attackers can execute arbitrary OS commands on Totolink A8000RU routers via the cstecgi.cgi handler, requiring immediate attention from network administrators.
- 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-2026-7140?
CVE-2026-7140 is a critical command injection vulnerability in Totolink A8000RU, published on 27 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability has been found in Totolink A8000RU 7.1cu.643_b20200521. Impacted is the function CsteSystem of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument HTTP leads to os command injection. The attack may be performed from remote. The exploit has been disclosed to the public and may be used.
Which versions are affected by CVE-2026-7140?
How do I fix CVE-2026-7140?
No fix has been published for CVE-2026-7140 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-2026-7140 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7140 exists.
Sources
Also known as GHSA-w55w-j5pr-6r9w.