CVE-2026-14818

Path Traversal in Zyxel Firewall CLI Allows Execution of Malicious Configuration Files

Published Aug 4, 2026 CVSS 3.1 · 7.2 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Title Path Traversal in Zyxel Firewall CLI Allows Execution of Malicious Configuration Files
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Zyxel
Zyxel atp Series Firmware
Zyxel usg20(w)-vpn Series Firmware
Zyxel usg Flex 50(w) Series Firmware
Zyxel usg Flex Series Firmware
Vendors & Products Zyxel
Zyxel atp Series Firmware
Zyxel usg20(w)-vpn Series Firmware
Zyxel usg Flex 50(w) Series Firmware
Zyxel usg Flex Series Firmware
Type Values Removed Values Added
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.
Weaknesses CWE-22
References
Metrics cvssV3_1

{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Zyxel
Published
Updated
Aug 4, 2026, 6:45 PM
Reserved
Jul 6, 2026, 8:22 AM
Status
Awaiting Analysis
Published
Aug 4, 2026, 4:16 AM
Modified
Aug 4, 2026, 7:16 PM