CVE-2026-5102: Totolink a3300r Firmware

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

A security flaw has been discovered in Totolink A3300R 17.0.0cu.557_b20221024. This vulnerability affects the function setSmartQosCfg of the file /cgi-bin/cstecgi.cgi of the component Parameter Handler. The manipulation of the argument qos_up_bw results in command injection. The attack can be executed remotely. The exploit has been released to the public and may 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.