Vulnerability · Published Aug 4, 2026 · Assigned by Zyxel
CVE-2026-14818
High 7.2
In plain English
A high-severity path traversal in ATP series firmware from Zyxel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities).
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| 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 |
Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H