CVE-2026-14818

State: Published
Severity: 7.2 High
Published: Aug 4, 2026
Updated: Aug 4, 2026
Reserved: Jul 6, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.2 High	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H	Zyxel

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Affected Products

Product	Versions
ATP series firmwareZyxel	from V4.32 through V5.42 Patch 1Affected
USG FLEX series firmwareZyxel	from V4.50 through V5.42 Patch 1Affected
USG FLEX 50(W) series firmwareZyxel	from V4.16 through V5.42 Patch 1Affected
USG20(W)-VPN series firmwareZyxel	from V4.16 through V5.42 Patch 1Affected

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-path-traversal-vulnerability-in-the-configuration-file-execution-cli-command-of-zld-firewalls-08-04-2026vendor-advisory

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