CVE-2020-25014: Zyxel Access Points Firmware

Critical severity, CVSS 9.8. EPSS: 4.4% chance of exploitation in the next 30 days.

A stack-based buffer overflow in fbwifi_continue.cgi on Zyxel UTM and VPN series of gateways running firmware version V4.30 through to V4.55 allows remote unauthenticated attackers to execute arbitrary code via a crafted http packet.

Affected products

• Zyxel Access Points Firmware: up to and including 6.10; version 6.10 only; affected versions not specified
• Zyxel Zld: from 4.30, up to and including 4.55

Published 2020-11-27. Last modified 2026-06-17.