High severity · published Aug 4, 2026
CVE-2026-14818
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…
7.2
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 47% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
ATP series firmware · Zyxel
from V4.32 through V5.42 Patch 1 · source: vendor
UF
USG FLEX 50(W) series firmware · Zyxel
from V4.16 through V5.42 Patch 1 · source: vendor
UF
USG FLEX series firmware · Zyxel
from V4.50 through V5.42 Patch 1 · source: vendor
US
USG20(W)-VPN series firmware · Zyxel
from V4.16 through V5.42 Patch 1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-14818
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-14818
www.zyxel.com
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
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