CVE-2026-14818
Received Received - Intake

Path Traversal in Zyxel ATP Series Firmware

Publication date: 2026-08-04

Last updated on: 2026-08-04

Assigner: Zyxel Corporation

Description
A path traversal vulnerability in the CLI command used to execute configuration files in Zyxel ATP series firmware versions from V4.32 through V5.42 Patch 1, USG FLEX series firmware versions from V4.50 through V5.42 Patch 1, USG FLEX 50(W) series firmware versions from V4.16 through V5.42 Patch 1, and USG20(W)-VPN series firmware versions from V4.16 through V5.42 Patch 1 could allow an authenticated attacker with administrator privileges to execute a crafted malicious configuration file on an affected device.

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Meta Information

Published
2026-08-04
Last Modified
2026-08-04
Generated
2026-08-04
AI Q&A
2026-08-04
EPSS Evaluated
N/A
NVD
CVE-2026-14818
EUVD
EUVD-2026-52569

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
zyxel atp_series_firmware From 4.32 (inc) to 5.42 (inc)
zyxel usg_flex_series_firmware From 4.50 (inc) to 5.42 (inc)
zyxel usg_flex_50w_series_firmware From 4.16 (inc) to 5.42 (inc)
zyxel usg20w_vpn_series_firmware From 4.16 (inc) to 5.42 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Attack-Flow Graph

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Executive Summary

This is a path traversal vulnerability in Zyxel ATP, USG FLEX, USG FLEX 50(W), and USG20(W)-VPN series firmware. It allows an authenticated admin to execute a malicious configuration file via a crafted CLI command, potentially leading to unauthorized actions on the device.

Detection Guidance

This vulnerability requires authenticated access with administrator privileges to exploit. Detection involves checking firmware versions of affected Zyxel devices. Review CLI command logs for suspicious configuration file executions or unauthorized file paths.

Impact Analysis

An attacker with admin access could exploit this to run malicious configurations, leading to device compromise, data breaches, or unauthorized network access. This could disrupt operations or allow further attacks on connected systems.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating GDPR (data protection) and HIPAA (health data security) requirements. Non-compliance may result in legal penalties, fines, or reputational damage.

Mitigation Strategies

Update affected Zyxel devices to firmware versions beyond V5.42 Patch 1. Restrict administrative access to CLI commands. Monitor configuration file uploads and executions for anomalies. Disable unnecessary services that may allow file uploads.

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