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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| 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 | — |
| Zyxel | USG20(W)-VPN series firmware | from V4.16 through V5.42 Patch 1 | — |
Advisories 1
- WID-SEC-2026-2627 Zyxel Firewall: Schwachstelle ermöglicht Codeausführung BSI CERT-Bund (WID) · Aug 3, 2026