CVE-2026-7750 Totolink N300RH POST Request cstecgi.cgi setMacFilterRules buffer overflow
Remote attackers can trigger a buffer overflow in the Totolink N300RH router via a crafted POST request, potentially leading to code execution or service disruption.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-7750?
CVE-2026-7750 is a high-severity memory corruption vulnerability in Totolink N300RH, published on 4 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was detected in Totolink N300RH 3.2.4-B20220812. This vulnerability affects the function setMacFilterRules of the file /cgi-bin/cstecgi.cgi of the component POST Request Handler. The manipulation of the argument mac_address results in buffer overflow. The attack may be launched remotely. The exploit is now public and may be used.
Which versions are affected by CVE-2026-7750?
How do I fix CVE-2026-7750?
No fix has been published for CVE-2026-7750 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-2026-7750 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7750 exists.
Sources
Also known as GHSA-7cwg-427v-p4xm.