Description
A cross-site scripting (XSS) vulnerability in the CGI program of the Zyxel ATP series firmware versions 5.10 through 5.37, USG FLEX series firmware versions 5.00 through 5.37, USG FLEX 50(W) series firmware versions 5.10 through 5.37, USG20(W)-VPN series firmware versions 5.10 through 5.37, and VPN series firmware versions 5.00 through 5.37, could allow an unauthenticated LAN-based attacker to store malicious scripts in a vulnerable device. A successful XSS attack could then result in the stored malicious scripts being executed to steal cookies when the user visits the specific CGI used for dumping ZTP logs.
CVSS breakdown
CVSS 3.1
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Affected products
- Zyxel / ATP series firmwareversions 5.10 through 5.37 – versions 5.10 through 5.37
- Zyxel / USG20(W)-VPN series firmware versions 5.10 through 5.37 – versions 5.10 through 5.37
- Zyxel / USG FLEX 50(W) series firmwareversions 5.10 through 5.37 – versions 5.10 through 5.37
- Zyxel / USG FLEX series firmware versions 5.00 through 5.37 – versions 5.00 through 5.37
- Zyxel / VPN series firmwareversions 5.00 through 5.37 – versions 5.00 through 5.37