What is CVE-2025-11730?

CVE-2025-11730 is a high-severity vulnerability in Zyxel Atp Series Firmware, classified under OS Command Injection. CVSS score: 7.2/10. Published 2026-02-05.

How severe is CVE-2025-11730?

High severity. CVSS v3 base score is 7.2 out of 10.

RCE in Zyxel Atp Series Firmware

CVE-2025-11730

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…

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.001 (27.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

Affected products

Zyxel Atp Series Firmware — versions versions from V5.35 through V5.41
Zyxel Usg20(w)-vpn Series Firmware — versions versions from V5.35 through V5.41
Zyxel Usg Flex 50(w) Series Firmware — versions versions from V5.35 through V5.41
Zyxel Usg Flex Series Firmware — versions versions from V5.35 through V5.41

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for… (vendor-advisory)

Frequently asked questions

What is CVE-2025-11730?: CVE-2025-11730 is a high-severity vulnerability in Zyxel Atp Series Firmware, classified under OS Command Injection. CVSS score: 7.2/10. Published 2026-02-05.
How severe is CVE-2025-11730?: High severity. CVSS v3 base score is 7.2 out of 10.