CVE-2023-22921: Zyxel Nbg-418n Firmware

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

A cross-site scripting (XSS) vulnerability in the Zyxel NBG-418N v2 firmware versions prior to V1.00(AARP.14)C0 could allow a remote authenticated attacker with administrator privileges to store malicious scripts using a web management interface parameter, resulting in denial-of-service (DoS) conditions on an affected device.

Affected products

• Zyxel Nbg-418n Firmware: up to and including 1.00\(aarp.13\)c0

Published 2023-05-01. Last modified 2026-06-17.