Description
An integer overflow vulnerability in the source code of the QuickSec IPSec toolkit used in the VPN feature of the Zyxel ATP series firmware versions 4.32 through 5.37, USG FLEX series firmware versions 4.50 through 5.37, USG FLEX 50(W) series firmware versions 4.16 through 5.37, USG20(W)-VPN series firmware versions 4.16 through 5.37, and VPN series firmware versions 4.30 through 5.37, could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions on an affected device by sending a crafted IKE packet.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected products
- Zyxel / ATP series firmwareversions 4.32 through 5.37 – versions 4.32 through 5.37
- Zyxel / USG20(W)-VPN series firmwareversions 4.16 through 5.37 – versions 4.16 through 5.37
- Zyxel / USG FLEX 50(W) series firmwareversions 4.16 through 5.37 – versions 4.16 through 5.37
- Zyxel / USG FLEX series firmwareversions 4.50 through 5.37 – versions 4.50 through 5.37
- Zyxel / VPN series firmwareversions 4.30 through 5.37 – versions 4.30 through 5.37