CVE-2026-5103: Totolink a3300r Firmware

High severity, CVSS 8.8. EPSS: 3.6% chance of exploitation in the next 30 days.

A weakness has been identified in Totolink A3300R 17.0.0cu.557_b20221024. This issue affects the function setUPnPCfg of the file /cgi-bin/cstecgi.cgi. This manipulation of the argument enable causes command injection. 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 a3300r Firmware: version 17.0.0cu.557_b20221024 only

Published 2026-03-30. Last modified 2026-06-17.