CVE-2022-40603

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.

Category

4.7
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.79% Top 30%
Vendor Advisory zyxel.com
Affected: Zyxel ZyWALL/USG series firmware
Affected: Zyxel VPN series firmware
Affected: Zyxel USG FLEX series firmware
Affected: Zyxel ATP series firmware
Published at:
Updated at:

References

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

Frequently Asked Questions

What is the severity of CVE-2022-40603?
CVE-2022-40603 has been scored as a medium severity vulnerability.
How to fix CVE-2022-40603?
To fix CVE-2022-40603, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-40603 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2022-40603 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-40603?
CVE-2022-40603 affects Zyxel ZyWALL/USG series firmware, Zyxel VPN series firmware, Zyxel USG FLEX series firmware, Zyxel ATP series firmware.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.