Description
An authentication bypass vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.20 through 4.70, USG FLEX series firmware versions 4.50 through 5.20, ATP series firmware versions 4.32 through 5.20, VPN series firmware versions 4.30 through 5.20, and NSG series firmware versions V1.20 through V1.33 Patch 4, which could allow an attacker to bypass the web authentication and obtain administrative access of the device.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected products
- Zyxel / ATP series firmware4.32 through 5.20 – 4.32 through 5.20
- Zyxel / NSG series firmware1.20 through 1.33 Patch 4 – 1.20 through 1.33 Patch 4
- Zyxel / USG FLEX series firmware4.50 through 5.20 – 4.50 through 5.20
- Zyxel / USG/ZyWALL series firmware4.20 through 4.70 – 4.20 through 4.70
- Zyxel / VPN series firmware4.30 through 5.20 – 4.30 through 5.20
Exploits & PoCs
- nucleiZyxel - Authentication Bypassby SleepingBag945,Powerexploit