Description
A null pointer dereference vulnerability in Zyxel ATP series firmware versions from V4.32 through V5.38, USG FLEX series firmware versions from V4.50 through V5.38, USG FLEX 50(W) series firmware versions from V5.20 through V5.38, and USG20(W)-VPN series firmware versions from V5.20 through V5.38 could allow an unauthenticated attacker to cause DoS conditions by sending crafted packets to a vulnerable device.
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 V4.32 through V5.38 – versions V4.32 through V5.38
- Zyxel / USG20(W)-VPN series firmwareversions V5.20 through V5.38 – versions V5.20 through V5.38
- Zyxel / USG FLEX 50(W) series firmwareversions V5.20 through V5.38 – versions V5.20 through V5.38
- Zyxel / USG FLEX series firmwareversions V4.50 through V5.38 – versions V4.50 through V5.38