CVE-2025-11730Network attack vector

Administrator command execution via crafted DDNS argument

Published Feb 5, 2026 · Updated Feb 5, 2026

OS command injection in affected Zyxel ZLD firewall firmware 5.35 through 5.41 allows remote authenticated users to execute commands via the DDNS CLI. The DDNS configuration CLI command passes a specially crafted string argument to an operating-system command path without neutralizing command syntax. Administrator privileges are required; affected ATP, USG FLEX, USG FLEX 50(W), and USG20(W)-VPN appliances then permit full OS command execution.

CVSS severity7.2
High
EPSS probability1.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in affected Zyxel ZLD firewall firmware 5.35 through 5.41 allows remote authenticated users to execute commands via the DDNS CLI. The DDNS configuration CLI command passes a specially crafted string argument to an operating-system command path without neutralizing command syntax. Administrator privileges are required; affected ATP, USG FLEX, USG FLEX 50(W), and USG20(W)-VPN appliances then permit full OS command execution.

The record

CVE
CVE-2025-11730
Published
Feb 5, 2026
Updated
Feb 5, 2026
Vendor
Zyxel Networks
Product
ZyWALL ATP Series
Classifications
CWE-78, T1059.008
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 5, 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=versions from V5.35 through V5.41

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Zyxel Networks · ZyWALL ATP Seriesversion=versions from V5.35 through V5.41
Zyxel Networks · USG FLEX Seriesversion=versions from V5.35 through V5.41
Zyxel Networks · USG20-VPN/USG20W-VPNversion=versions from V5.35 through V5.41
Zyxel Networks · USG FLEX 50/50W Seriesversion=versions from V5.35 through V5.41

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-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
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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