Vulnerability Intelligence Report
Zyxel Multiple Products Use of Hard-Coded Credentials Vulnerability
CVE-2020-29583
Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with an unchangeable password. The password for this account can be found in cleartext in the firmware. This account can be used by someone to login to the ssh server or web interface with admin privileges.
CISA KEV
Nuclei Template
SSVC: Active Exploitation
Automatable
CVSS Base Score
9.8
CRITICAL
Exploitability:3.9
Impact Score:5.9
EPSS Probability:90.05%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-522 ↗CWE-522 Insufficiently Protected Credentials
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| zyxel | usg20-vpn_firmware | 4.60 |
| zyxel | usg20-vpn | all |
| zyxel | usg20w-vpn_firmware | 4.60 |
| zyxel | usg20w-vpn | all |
| zyxel | usg40_firmware | 4.60 |
| zyxel | usg40 | all |
| zyxel | usg40w_firmware | 4.60 |
| zyxel | usg40w | all |
| zyxel | usg60_firmware | 4.60 |
| zyxel | usg60 | all |
| zyxel | usg60w_firmware | 4.60 |
| zyxel | usg60w | all |
| zyxel | usg110_firmware | 4.60 |
| zyxel | usg110 | all |
| zyxel | usg210_firmware | 4.60 |
| zyxel | usg210 | all |
| zyxel | usg310_firmware | 4.60 |
| zyxel | usg310 | all |
| zyxel | usg1100_firmware | 4.60 |
| zyxel | usg1100 | all |
| zyxel | usg1900_firmware | 4.60 |
| zyxel | usg1900 | all |
| zyxel | usg2200_firmware | 4.60 |
| zyxel | usg2200 | all |
| zyxel | zywall110_firmware | 4.60 |
| zyxel | zywall110 | all |
| zyxel | zywall310_firmware | 4.60 |
| zyxel | zywall310 | all |
| zyxel | zywall1100_firmware | 4.60 |
| zyxel | zywall1100 | all |
| zyxel | atp100_firmware | 4.60 |
| zyxel | atp100 | all |
| zyxel | atp100w_firmware | 4.60 |
| zyxel | atp100w | all |
| zyxel | atp200_firmware | 4.60 |
| zyxel | atp200 | all |
| zyxel | atp500_firmware | 4.60 |
| zyxel | atp500 | all |
| zyxel | atp700_firmware | 4.60 |
| zyxel | atp700 | all |
| zyxel | atp800_firmware | 4.60 |
| zyxel | atp800 | all |
| zyxel | vpn50_firmware | 4.60 |
| zyxel | vpn50 | all |
| zyxel | vpn100_firmware | 4.60 |
| zyxel | vpn100 | all |
| zyxel | vpn300_firmware | 4.60 |
| zyxel | vpn300 | all |
| zyxel | vpn1000_firmware | 4.60 |
| zyxel | vpn1000 | all |
| zyxel | usg_flex_100_firmware | 4.60 |
| zyxel | usg_flex_100 | all |
| zyxel | usg_flex_100w_firmware | 4.60 |
| zyxel | usg_flex_100w | all |
| zyxel | usg_flex_200_firmware | 4.60 |
| zyxel | usg_flex_200 | all |
| zyxel | usg_flex_500_firmware | 4.60 |
| zyxel | usg_flex_500 | all |
| zyxel | usg_flex_700_firmware | 4.60 |
| zyxel | usg_flex_700 | all |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
CISA KEV
ACTIVE IN CATALOG
Nuclei Template
SCANNER AVAILABLE
EPSS Score
90.049%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | MITRE Corporation · N/A · USA |
| Reserved | 2020-12-06T00:00:00 |
| Published | 2020-12-22T00:00:00 |
| Last Updated | 2025-10-21T23:35:31 |
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