Vulnerability Intelligence Report
CVE-2023-22916
The configuration parser of Zyxel ATP series firmware versions 5.10 through 5.35, USG FLEX series firmware versions 5.00 through 5.35, USG FLEX 50(W) firmware versions 5.10 through 5.35, USG20(W)-VPN firmware versions 5.10 through 5.35, and VPN series firmware versions 5.00 through 5.35, which fails to properly sanitize user input. A remote unauthenticated attacker could leverage the vulnerability to modify device configuration data, resulting in DoS conditions on an affected device if the attacker could trick an authorized administrator to switch the management mode to the cloud mode.
No Active Exploit Signals
CVSS Base Score
8.1
HIGH
Exploitability:2.9
Impact Score:5.2
EPSS Probability:0.69%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-20 ↗CWE-20: Improper Input Validation
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Zyxel | ATP series firmware | 5.10 through 5.35 (affected) |
| Zyxel | USG FLEX series firmware | 5.00 through 5.35 (affected) |
| Zyxel | USG FLEX 50(W) firmware | 5.10 through 5.35 (affected) |
| Zyxel | USG20(W)-VPN firmware | 5.10 through 5.35 (affected) |
| Zyxel | VPN series firmware | 5.00 through 5.35 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.693%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Zyxel Corporation · Vendor · Taiwan |
| Reserved | 2023-01-10T00:00:00 |
| Published | 2023-04-24T00:00:00 |
| Last Updated | 2025-02-12T16:42:02 |
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