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.
problem types: CWE-287: Improper Authentication
affected:
{
product: USG/ZyWALL series firmware
vendor: Zyxel
versions:
status: affected, version: 4.20 through 4.70
}
{
product: USG FLEX series firmware
vendor: Zyxel
versions:
status: affected, version: 4.50 through 5.20
}
{
product: ATP series firmware
vendor: Zyxel
versions:
status: affected, version: 4.32 through 5.20
}
{
product: VPN series firmware
vendor: Zyxel
versions:
status: affected, version: 4.30 through 5.20
}
{
product: NSG series firmware
vendor: Zyxel
versions:
status: affected, version: 1.20 through 1.33 Patch 4
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 9.8
baseSeverity: CRITICAL
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
version: 3.1
]