CVE-2026-14818
High
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.
SeverityHigh
CVSS7.2
Exploit probability—
Product
USG20(W)-VPN series firmware
PublishedAug 4, 2026
First seenAug 4, 2026
Weakness typeCWE-22Path traversal
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Zyxel USG20(W)-VPN series firmware | from V4.16 through V5.42 Patch 1 | — |
| Zyxel ATP series firmware | from V4.32 through V5.42 Patch 1 | — |
| Zyxel USG FLEX series firmware | from V4.50 through V5.42 Patch 1 | — |
| Zyxel USG FLEX 50(W) series firmware | from V4.16 through V5.42 Patch 1 | — |
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