CVE-2023-33013: Zyxel NBG6604 Firmware

High severity, CVSS 8.8. EPSS: 1.7% chance of exploitation in the next 30 days.

A post-authentication command injection vulnerability in the NTP feature of Zyxel NBG6604 firmware version V1.01(ABIR.1)C0 could allow an authenticated attacker to execute some OS commands remotely by sending a crafted HTTP request.

Affected products

• Zyxel NBG6604 Firmware: version 1.01(abir.1)c0 only

Published 2023-08-14. Last modified 2026-06-17.