CVE-2026-7243 Totolink A8000RU CGI cstecgi.cgi setRadvdCfg os command injection
Remote attackers can execute arbitrary OS commands on Totolink A8000RU routers via the setRadvdCfg 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-2026-7243?
CVE-2026-7243 is a critical command injection vulnerability in Totolink A8000RU, published on 28 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was identified in Totolink A8000RU 7.1cu.643_b20200521. The affected element is the function setRadvdCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument maxRtrAdvInterval leads to os command injection. It is possible to initiate the attack remotely. The exploit is publicly available and might be used.
Which versions are affected by CVE-2026-7243?
How do I fix CVE-2026-7243?
No fix has been published for CVE-2026-7243 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-2026-7243 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7243 exists.
Sources
Also known as GHSA-q8m8-qph9-6p9p.