CVE-2026-7717 Totolink WA300 POST Request cstecgi.cgi UploadCustomModule buffer overflow
Remote attackers can trigger a buffer overflow in the WA300 router's upload handler, potentially leading to arbitrary code execution.
- 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-2026-7717?
CVE-2026-7717 is a high-severity memory corruption vulnerability in Totolink WA300, 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 determined in Totolink WA300 5.2cu.7112_B20190227. This issue affects the function UploadCustomModule of the file /cgi-bin/cstecgi.cgi of the component POST Request Handler. Executing a manipulation of the argument File can lead to buffer overflow. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized.
Which versions are affected by CVE-2026-7717?
How do I fix CVE-2026-7717?
No fix has been published for CVE-2026-7717 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-2026-7717 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7717 exists.
Sources
Also known as GHSA-mxxp-5rcc-wx4q.