CVE-2026-79911 TOTOLINK N600R CGI cstecgi.cgi setSystemConfig stack-based overflow
A remote attacker can trigger a stack-based buffer overflow in the TOTOLINK N600R router's CGI handler via the Hostname argument, potentially executing arbitrary code.
- 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-2026-79911?
CVE-2026-79911 is a critical memory corruption vulnerability in TOTOLINK N600R, published on 25 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A security vulnerability has been detected in TOTOLINK N600R 4.3.0cu.7647_B20210106. The affected element is the function setSystemConfig of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument Hostname leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used.
Which versions are affected by CVE-2026-79911?
How do I fix CVE-2026-79911?
No fix has been published for CVE-2026-79911 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-79911 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-79911 exists.
Sources
Also known as GHSA-wgfc-85p2-7526.