CVE-2026-14818Network attack vector

Crafted configuration execution via unrestricted CLI path

Published Aug 4, 2026 · Updated Aug 4, 2026

Path traversal in ZLD firewall firmware allows remote authenticated users with administrator privileges to execute crafted configuration files. The configuration-file execution CLI command accepts a crafted path without restricting it to the intended directory, then executes the referenced configuration. Exploitation requires administrator access to the device CLI and grants the configuration actions available to that privileged interface.

CVSS severity7.2
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in ZLD firewall firmware allows remote authenticated users with administrator privileges to execute crafted configuration files. The configuration-file execution CLI command accepts a crafted path without restricting it to the intended directory, then executes the referenced configuration. Exploitation requires administrator access to the device CLI and grants the configuration actions available to that privileged interface.

The record

CVE
CVE-2026-14818
Published
Aug 4, 2026
Updated
Aug 4, 2026
Vendor
Zyxel Networks
Product
USG20(W)-VPN Series
Classifications
CWE-22, T1059.008
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=from V4.16 through V5.42 Patch 1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Zyxel Networks · USG20(W)-VPN Seriesversion=from V4.16 through V5.42 Patch 1
Zyxel Networks · USG FLEX 50 Seriesversion=from V4.16 through V5.42 Patch 1
Zyxel Networks · ATP Seriesversion=from V4.32 through V5.42 Patch 1
Zyxel Networks · USG FLEX Seriesversion=from V4.50 through V5.42 Patch 1

Published CVSS scores

7.2Zyxel CorporationCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1059.008Command and Scripting Interpreter: Network Device CLI

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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