CVE-2022-40603: Zyxel ATP100 Firmware

Medium severity, CVSS 6.1. EPSS: 0.4% chance of exploitation in the next 30 days.

A cross-site scripting (XSS) vulnerability in the CGI program of Zyxel ZyWALL/USG series firmware versions 4.30 through 4.72, VPN series firmware versions 4.30 through 5.31, USG FLEX series firmware versions 4.50 through 5.31, and ATP series firmware versions 4.32 through 5.31, which could allow an attacker to trick a user into visiting a crafted URL with the XSS payload. Then, the attacker could gain access to some browser-based information if the malicious script is executed on the victim’s browser.

Affected products

• Zyxel ATP100 Firmware: from 4.32, up to and including 5.31
• Zyxel ATP100W Firmware: from 4.32, up to and including 5.31
• Zyxel ATP200 Firmware: from 4.32, up to and including 5.31
• Zyxel ATP500 Firmware: from 4.32, up to and including 5.31
• Zyxel ATP700 Firmware: from 4.32, up to and including 5.31
• Zyxel ATP800 Firmware: from 4.32, up to and including 5.31
• Zyxel USG40 Firmware: from 4.30, up to and including 4.72
• Zyxel USG40W Firmware: from 4.30, up to and including 4.72
• Zyxel USG60 Firmware: from 4.30, up to and including 4.72
• Zyxel USG60W Firmware: from 4.30, up to and including 4.72
• Zyxel Usg Flex 100w Firmware: from 4.50, up to and including 5.31
• Zyxel Usg Flex 200 Firmware: from 4.50, up to and including 5.31
• Zyxel Usg Flex 500 Firmware: from 4.50, up to and including 5.31
• Zyxel Usg Flex 50w Firmware: from 4.50, up to and including 5.31
• Zyxel Usg Flex 700 Firmware: from 4.50, up to and including 5.31
• Zyxel VPN1000 Firmware: from 4.30, up to and including 5.31
• Zyxel VPN100 Firmware: from 4.30, up to and including 5.31
• Zyxel VPN300 Firmware: from 4.30, up to and including 5.31
• Zyxel VPN50 Firmware: from 4.30, up to and including 5.31

Published 2022-12-06. Last modified 2026-06-17.