Description
The configuration parser of Zyxel ATP series firmware versions 5.10 through 5.35, USG FLEX series firmware versions 5.00 through 5.35, USG FLEX 50(W) firmware versions 5.10 through 5.35, USG20(W)-VPN firmware versions 5.10 through 5.35, and VPN series firmware versions 5.00 through 5.35, which fails to properly sanitize user input. A remote unauthenticated attacker could leverage the vulnerability to modify device configuration data, resulting in DoS conditions on an affected device if the attacker could trick an authorized administrator to switch the management mode to the cloud mode.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High
Affected products
- Zyxel / ATP series firmware5.10 through 5.35 – 5.10 through 5.35
- Zyxel / USG20(W)-VPN firmware5.10 through 5.35 – 5.10 through 5.35
- Zyxel / USG FLEX 50(W) firmware5.10 through 5.35 – 5.10 through 5.35
- Zyxel / USG FLEX series firmware5.00 through 5.35 – 5.00 through 5.35
- Zyxel / VPN series firmware5.00 through 5.35 – 5.00 through 5.35