CVE-2026-19811: Totolink a800r

High severity, CVSS 8.8. EPSS: 0.9% chance of exploitation in the next 30 days.

A security flaw has been discovered in TOTOLINK A800R 4.1.2cu.5137_B20200730. The impacted element is the function setIpQosRules of the file /cgi-bin/cstecgi.cgi of the component firewall.so. The manipulation of the argument Comment results in stack-based buffer overflow. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.

Affected products

• Totolink a800r: version 4.1.2cu.5137_B20200730 only

Published 2026-08-14. Last modified 2026-08-18.