CVE-2026-25857: Tenda g300-F Firmware

High severity, CVSS 8.8. EPSS: 3.2% chance of exploitation in the next 30 days.

Tenda G300-F router firmware version 16.01.14.2 and prior contain an OS command injection vulnerability in the WAN diagnostic functionality (formSetWanDiag). The implementation constructs a shell command that invokes curl and incorporates attacker-controlled input into the command line without adequate neutralization. As a result, a remote attacker with access to the affected management interface can inject additional shell syntax and execute arbitrary commands on the device with the privileges of the management process.

Affected products

• Tenda g300-F Firmware: up to and including 16.01.14.2

Published 2026-02-07. Last modified 2026-06-17.