CVE-2026-19815 TOTOLINK A800R firewall.so cstecgi.cgi setParentalRules stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the firewall component via the setParentalRules function, potentially leading to 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-2026-19815?
CVE-2026-19815 is a high-severity memory corruption vulnerability in TOTOLINK A800R, published on 14 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw has been found in TOTOLINK A800R 4.1.2cu.5137_B20200730. Affected by this vulnerability is the function setParentalRules of the file /cgi-bin/cstecgi.cgi of the component firewall.so. Executing a manipulation of the argument urlKeyword can lead to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been published and may be used.
Which versions are affected by CVE-2026-19815?
How do I fix CVE-2026-19815?
No fix has been published for CVE-2026-19815 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-2026-19815 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-19815 exists.
Sources
Also known as GHSA-qr8q-rv2p-7cjh.