What’s Vulnerable › Vulnerabilities

CVE-2022-40603

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-12-06 · updated 2026-06-17
• Weakness: CWE-79

Description

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 through 5.31
• Zyxel Atp100W Firmware: from 4.32 through 5.31
• Zyxel Atp200 Firmware: from 4.32 through 5.31
• Zyxel Atp500 Firmware: from 4.32 through 5.31
• Zyxel Atp700 Firmware: from 4.32 through 5.31
• Zyxel Atp800 Firmware: from 4.32 through 5.31
• Zyxel Usg40 Firmware: from 4.30 through 4.72
• Zyxel Usg40W Firmware: from 4.30 through 4.72
• Zyxel Usg60 Firmware: from 4.30 through 4.72
• Zyxel Usg60W Firmware: from 4.30 through 4.72
• Zyxel USG FLEX 100(W) firmware: from 4.50 through 5.31
• Zyxel USG FLEX 200 firmware: from 4.50 through 5.31
• Zyxel USG FLEX 500 firmware: from 4.50 through 5.31
• Zyxel USG FLEX 50(W) firmware: from 4.50 through 5.31
• Zyxel USG FLEX 700 firmware: from 4.50 through 5.31
• Zyxel Vpn1000 Firmware: from 4.30 through 5.31
• Zyxel Vpn100 Firmware: from 4.30 through 5.31
• Zyxel Vpn300 Firmware: from 4.30 through 5.31
• Zyxel Vpn50 Firmware: from 4.30 through 5.31

References

• https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-xss-vulnerability-in-firewalls
• https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-xss-vulnerability-in-firewalls

Get alerted when CVE-2022-40603 or the next vulnerability affects your stack