High 7.2Published Feb 4, 2026

CVE-2025-11730A post‑authentication command injection vulnerability in the Dynamic DNS (DDNS) configuration CLI command in Zyxel ATP series firmware versions from V5.35 through V5.41, USG FLEX series firmware vers…

Updated under an hour ago (Oct 27, 2026, 5:00 PM ET)

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It affects Zyxel ATP series firmware and 3 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Zyxel ATP series firmware

Exploited in the last 30 days

A post‑authentication command injection vulnerability in the Dynamic DNS (DDNS) configuration CLI command in Zyxel ATP series firmware versions from V5.35 through V5.41, USG FLEX series firmware versions from V5.35 through V5.41, USG FLEX 50(W) series firmware versions from V5.35 through V5.41, and USG20(W)-VPN series firmware versions from V5.35 through V5.41 could allow an authenticated attacker with administrator privileges to execute operating system (OS) commands on an affected device by supplying a specially crafted string as an argument to the CLI command.

CVSS: 7.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-78
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Zyxel
NVD analysis: Deferred
Record last updated: Feb 26, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Zyxel ATP series firmware zyxel:atp_series_firmware (from the name)	versions from V5.35 through V5.41	CNA record
Zyxel USG FLEX series firmware zyxel:usg_flex_series_firmware (from the name)	versions from V5.35 through V5.41	CNA record
Zyxel USG FLEX 50(W) series firmware zyxel:usg_flex_50_w_series_firmware (from the name)	versions from V5.35 through V5.41	CNA record
Zyxel USG20(W)-VPN series firmware zyxel:usg20_w_vpn_series_firmware (from the name)	versions from V5.35 through V5.41	CNA record

References

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-post-authentication-command-injection-vulnerability-in-the-ddns-configuration-cli-command-of-zld-firewalls-02-05-2026	vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.