CVE-2026-14818
Zyxel ATP/USG Path Traversal Vulnerability
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.
INFO
Published Date :
Aug. 4, 2026, 4:16 a.m.
Last Modified :
Aug. 4, 2026, 4:16 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-14818
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 96e50032-ad0d-4058-a115-4d2c13821f9f | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update firmware to the latest available version.
- Apply vendor patches for affected devices.
- Restrict administrator privileges where possible.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-14818.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-14818 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-14818
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-14818 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-14818 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Aug. 04, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Zyxel', 'product': 'ATP series firmware', 'versions': [{'status': 'affected', 'version': 'from V4.32 through V5.42 Patch 1'}], 'defaultStatus': 'unaffected'}, {'vendor': 'Zyxel', 'product': 'USG FLEX series firmware', 'versions': [{'status': 'affected', 'version': 'from V4.50 through V5.42 Patch 1'}], 'defaultStatus': 'unaffected'}, {'vendor': 'Zyxel', 'product': 'USG FLEX 50(W) series firmware', 'versions': [{'status': 'affected', 'version': 'from V4.16 through V5.42 Patch 1'}], 'defaultStatus': 'unaffected'}, {'vendor': 'Zyxel', 'product': 'USG20(W)-VPN series firmware', 'versions': [{'status': 'affected', 'version': 'from V4.16 through V5.42 Patch 1'}], 'defaultStatus': 'unaffected'}] Added 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. Added CVSS V3.1 AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-22 Added Reference 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