CVE-2026-19812: Totolink a800r

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

A weakness has been identified in TOTOLINK A800R 4.1.2cu.5137_B20200730. This affects the function UploadCustomModule of the file /cgi-bin/cstecgi.cgi of the component product.so. This manipulation of the argument File causes stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks.

Affected products

• Totolink a800r: version 4.1.2cu.5137_B20200730 only

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