CVE-2026-19813: Totolink a800r

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

A security vulnerability has been detected in TOTOLINK A800R 4.1.2cu.5137_B20200730. This impacts the function setMacFilterRules of the file /cgi-bin/cstecgi.cgi of the component firewall.so. Such manipulation of the argument Comment leads to stack-based buffer overflow. The attack may be performed from remote. The exploit has been disclosed publicly and may be used.

Affected products

• Totolink a800r: version 4.1.2cu.5137_B20200730 only

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