Description
A directory traversal vulnerability caused by specific character sequences within an improperly sanitized URL was identified in some CGI programs of Zyxel USG FLEX 100(W) firmware versions 4.50 through 5.30, USG FLEX 200 firmware versions 4.50 through 5.30, USG FLEX 500 firmware versions 4.50 through 5.30, USG FLEX 700 firmware versions 4.50 through 5.30, USG FLEX 50(W) firmware versions 4.16 through 5.30, USG20(W)-VPN firmware versions 4.16 through 5.30, ATP series firmware versions 4.32 through 5.30, VPN series firmware versions 4.30 through 5.30, USG/ZyWALL series firmware versions 4.11 through 4.72, that could allow an authenticated attacker to access some restricted files on a vulnerable device.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected products
- Zyxel / ATP series firmware4.32 through 5.30 – 4.32 through 5.30
- Zyxel / USG 20(W)-VPN firmware4.16 through 5.30 – 4.16 through 5.30
- Zyxel / USG FLEX 100(W) firmware4.50 through 5.30 – 4.50 through 5.30
- Zyxel / USG FLEX 200 firmware4.50 through 5.30 – 4.50 through 5.30
- Zyxel / USG FLEX 500 firmware4.50 through 5.30 – 4.50 through 5.30
- Zyxel / USG FLEX 50(W) firmware4.16 through 5.30 – 4.16 through 5.30
- Zyxel / USG FLEX 700 firmware4.50 through 5.30 – 4.50 through 5.30
- Zyxel / USG/ZyWALL series firmware4.11 through 4.72 – 4.11 through 4.72
- Zyxel / VPN series firmware4.30 through 5.30 – 4.30 through 5.30