Vulnerability Intelligence Report
Zyxel Multiple Firewalls OS Command Injection Vulnerability
CVE-2022-30525
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.
CISA KEV
Nuclei Template
SSVC: Active Exploitation
Automatable
CVSS Base Score
9.8
CRITICAL
Exploitability:3.9
Impact Score:5.9
EPSS Probability:99.94%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-78 ↗CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Zyxel | USG FLEX 100(W) firmware | 5.00 through 5.21 Patch 1 (affected) |
| Zyxel | USG FLEX 200 firmware | 5.00 through 5.21 Patch 1 (affected) |
| Zyxel | USG FLEX 500 firmware | 5.00 through 5.21 Patch 1 (affected) |
| Zyxel | USG FLEX 700 firmware | 5.00 through 5.21 Patch 1 (affected) |
| Zyxel | ATP series firmware | 5.10 through 5.21 Patch 1 (affected) |
| Zyxel | VPN series firmware | 4.60 through 5.21 Patch 1 (affected) |
| Zyxel | USG FLEX 50(W) firmware | 5.10 through 5.21 Patch 1 (affected) |
| Zyxel | USG 20(W)-VPN firmware | 5.10 through 5.21 Patch 1 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
CISA KEV
ACTIVE IN CATALOG
Nuclei Template
SCANNER AVAILABLE
EPSS Score
99.938%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Zyxel Corporation · Vendor · Taiwan |
| Reserved | 2022-05-10T00:00:00 |
| Published | 2022-05-12T13:05:11 |
| Last Updated | 2025-10-21T23:15:39 |
Community Chatter & Buzz