description: A OS command injection vulnerability in the CGI program of Zyxel USG FLEX 100(W) firmware versions 5.00 through 5.21 Patch 1, USG FLEX 200 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 500 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 700 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 50(W) firmware versions 5.10 through 5.21 Patch 1, USG20(W)-VPN firmware versions 5.10 through 5.21 Patch 1, ATP series firmware versions 5.10 through 5.21 Patch 1, VPN series firmware versions 4.60 through 5.21 Patch 1, which could allow an attacker to modify specific files and then execute some OS commands on a vulnerable device.
problem types: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
affected:
{
product: USG FLEX 100(W) firmware
vendor: Zyxel
versions:
status: affected, version: 5.00 through 5.21 Patch 1
}
{
product: USG FLEX 200 firmware
vendor: Zyxel
versions:
status: affected, version: 5.00 through 5.21 Patch 1
}
{
product: USG FLEX 500 firmware
vendor: Zyxel
versions:
status: affected, version: 5.00 through 5.21 Patch 1
}
{
product: USG FLEX 700 firmware
vendor: Zyxel
versions:
status: affected, version: 5.00 through 5.21 Patch 1
}
{
product: ATP series firmware
vendor: Zyxel
versions:
status: affected, version: 5.10 through 5.21 Patch 1
}
{
product: VPN series firmware
vendor: Zyxel
versions:
status: affected, version: 4.60 through 5.21 Patch 1
}
{
product: USG FLEX 50(W) firmware
vendor: Zyxel
versions:
status: affected, version: 5.10 through 5.21 Patch 1
}
{
product: USG 20(W)-VPN firmware
vendor: Zyxel
versions:
status: affected, version: 5.10 through 5.21 Patch 1
}
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
]