CVE-2026-6140 Totolink A7100RU CGI cstecgi.cgi UploadFirmwareFile os command injection
Remote attackers can execute arbitrary OS commands on Totolink A7100RU routers via the firmware upload 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-2026-6140?
CVE-2026-6140 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 vulnerability was found in Totolink A7100RU 7.4cu.2313_b20191024. This impacts the function UploadFirmwareFile of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Performing a manipulation of the argument FileName results in os command injection. The attack may be initiated remotely. The exploit has been made public and could be used.
Which versions are affected by CVE-2026-6140?
How do I fix CVE-2026-6140?
No fix has been published for CVE-2026-6140 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-2026-6140 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-6140 exists.
Sources
Also known as GHSA-qq79-56j7-gmq4.