CVE-2026-5339: Tenda g103 Firmware

High severity, CVSS 8.8. EPSS: 10.2% chance of exploitation in the next 30 days.

A vulnerability was detected in Tenda G103 1.0.0.5. The impacted element is the function action_set_net_settings of the file gpon.lua of the component Setting Handler. Performing a manipulation of the argument authLoid/authLoidPassword/authPassword/authSerialNo/authType/oltType/usVlanId/usVlanPriority results in command injection. It is possible to initiate the attack remotely. The exploit is now public and may be used.

Affected products

• Tenda g103 Firmware: version 1.0.0.5 only

Published 2026-04-02. Last modified 2026-07-24.