Cross-Site Scripting Vulnerability in Zyxel ATP and USG FLEX Firmware
CVE-2023-35139

6.1MEDIUM

Key Information:

Vendor

Zyxel
Status
ATP series firmware
USG FLEX series firmware
USG FLEX 50(W) series firmware
USG20(W)-VPN series firmware
Vendor
CVE Published:
28 November 2023

What is CVE-2023-35139?

A cross-site scripting vulnerability exists in the CGI program of Zyxel's ATP series and USG FLEX series firmware. This flaw affects multiple firmware versions, allowing unauthenticated LAN-based attackers to store malicious scripts on vulnerable devices. If exploited, these scripts may execute and lead to the theft of cookies when users access specific CGIs used for ZTP log dumping. This vulnerability poses a significant risk to affected products by enabling attackers to manipulate sessions and extract sensitive information.

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Affected Version(s)

USG FLEX 50(W) series firmware versions 5.10 through 5.37

ATP series firmware versions 5.10 through 5.37

USG FLEX series firmware versions 5.00 through 5.37

References

https://www.zyxel.com/global/en/support/security-advisori...
vendor-advisory

CVSS V3.1

Score:
6.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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