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.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected products
- Zyxel / ATP series firmwareversions from V5.35 through V5.41 – versions from V5.35 through V5.41
- Zyxel / USG20(W)-VPN series firmwareversions from V5.35 through V5.41 – versions from V5.35 through V5.41
- Zyxel / USG FLEX 50(W) series firmwareversions from V5.35 through V5.41 – versions from V5.35 through V5.41
- Zyxel / USG FLEX series firmwareversions from V5.35 through V5.41 – versions from V5.35 through V5.41