CVE-2026-14818 — Zyxel / ATP series firmware

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
Zyxel / ATP series firmware	affected from V4.32 through V5.42 Patch 1
Zyxel / USG FLEX series firmware	affected from V4.50 through V5.42 Patch 1
Zyxel / USG FLEX 50(W) series firmware	affected from V4.16 through V5.42 Patch 1
Zyxel / USG20(W)-VPN series firmware	affected from V4.16 through V5.42 Patch 1

CWE

CWE-22

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-08-04-2026

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.