Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2020-29583

Severity CVSS v4.0:
Pending analysis
Type:
CWE-522 Insufficiently Protected Credentials
Publication date:
22/12/2020
Last modified:
07/11/2025

Description

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.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 9.80 CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
9.80
Severity 3.x
CRITICAL
Vector 2.0
AV:N/AC:L/Au:N/C:C/I:C/A:C CVSS v2.0 Severity and Metrics:

Base Score: 10.00 HIGH
Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C

Attack Vector (AV): Network
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): Complete
Integrity (I): Complete
Availability (A): Complete

Base Score 2.0
10.00
Severity 2.0
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:zyxel:usg20-vpn_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg20-vpn:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg20w-vpn_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg20w-vpn:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg40_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg40:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg40w_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg40w:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg60_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg60:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg60w_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg60w:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg110_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg110:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg210_firmware:4.60:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools