CVE-2026-14818

HIGH

Zyxel Atp Series Firmware - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Title source: rule

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.

References (1)

Core 1

Core References

Vendor Advisory vendor-advisory

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-08-04-2026

Scores

CVSS v3 7.2

EPSS 0.0036

EPSS Percentile 28.6%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-22

Status published

Products (4)

Zyxel/ATP series firmware from V4.32 through V5.42 Patch 1

Zyxel/USG FLEX 50(W) series firmware from V4.16 through V5.42 Patch 1

Zyxel/USG FLEX series firmware from V4.50 through V5.42 Patch 1

Zyxel/USG20(W)-VPN series firmware from V4.16 through V5.42 Patch 1

Published Aug 04, 2026

Tracked Since Aug 04, 2026