CVE-2021-3166: ASUS DSL-n14u b1 Firmware

High severity, CVSS 7.5. EPSS: 2.9% chance of exploitation in the next 30 days.

An issue was discovered on ASUS DSL-N14U-B1 1.1.2.3_805 devices. An attacker can upload arbitrary file content as a firmware update when the filename Settings_DSL-N14U-B1.trx is used. Once this file is loaded, shutdown measures on a wide range of services are triggered as if it were a real update, resulting in a persistent outage of those services.

Affected products

• ASUS DSL-n14u b1 Firmware: version 1.1.2.3_805 only

Published 2021-01-18. Last modified 2026-06-17.