CVE-2025-11730: Zyxel ATP series firmware · OS Command Injection
Affects Zyxel ATP series firmwareSource CVE Database V5
Not known to be exploited · CVSS 7.2 High.
Data as of 26 Oct 2026, 08:30 UTC
- EPSS
- 1.4% chance of exploitation in 30 days – higher than 73% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 5 Feb 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| ZyxelATP series firmware | Affected
| Fixed in– |
| ZyxelUSG FLEX series firmware | Affected
| Fixed in– |
| ZyxelUSG FLEX 50(W) series firmware | Affected
| Fixed in– |
| ZyxelUSG20(W)-VPN series firmware | Affected
| Fixed in– |
AI-suggested
To mitigate CVE-2025-11730, organizations should first verify if their Zyxel devices run affected firmware versions (5.35 through 5.41) and prioritize upgrading to patched versions once available. In the absence of immediate patches, restrict administrative access to trusted personnel and networks using strong authentication methods and network segmentation. Disable or limit the use of the DDNS feature if not required, or restrict CLI access to the DDNS configuration commands. Implement strict monitoring and logging of CLI commands and administrative activities to detect anomalous or suspicious inputs indicative of exploitation attempts. Employ network intrusion detection systems (NIDS) to identify unusual command injection patterns or unexpected device behavior. Regularly audit device configurations and credentials to minimize the risk of privilege escalation. Engage with Zyxel support for any available interim fixes or workarounds and maintain awareness of updates regarding this vulnerability.
Description
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.