CVE-2020-29583

Zyxel Multiple Products Use of Hard-Coded Credentials Vulnerability

Severity Score

9.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

Yes

*KEV

Decision

*SSVC

Descriptions

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.

La versión de firmware 4.60 de los dispositivos Zyxel USG contiene una cuenta no documentada (zyfwp) con una contraseña que no puede ser cambiada. La contraseña para esta cuenta se puede encontrar en texto sin cifrar en el firmware. Esta cuenta puede ser usada por alguien para iniciar sesión en el servidor ssh o en la interfaz web con privilegios de administrador

Zyxel firewalls (ATP, USG, VM) and AP Controllers (NXC2500 and NXC5500) contain a use of hard-coded credentials vulnerability in an undocumented account ("zyfwp") with an unchangeable password.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-12-06 CVE Reserved
2020-12-22 CVE Published
2021-11-03 Exploited in Wild
2022-05-03 KEV Due Date
2024-08-04 CVE Updated
2024-10-18 EPSS Updated
---------- First Exploit

CWE

CWE-522: Insufficiently Protected Credentials

CAPEC

References (7)

URL	Tag	Source
http://ftp.zyxel.com/USG40/firmware/USG40_4.60%28AALA.1%29C0_2.pdf
https://www.eyecontrol.nl/blog/undocumented-user-account-in-zyxel-products.html	Third Party Advisory
https://www.secpod.com/blog/a-secret-zyxel-firewall-and-ap-controllers-could-allow-for-administrative-access-cve-2020-29583

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://businessforum.zyxel.com/discussion/5252/zld-v4-60-revoke-and-wk48-firmware-release	2023-11-07
https://businessforum.zyxel.com/discussion/5254/whats-new-for-zld4-60-patch-1-available-on-dec-15	2023-11-07
https://www.zyxel.com/support/CVE-2020-29583.shtml	2023-11-07
https://www.zyxel.com/support/security_advisories.shtml	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Zyxel Search vendor "Zyxel"	Usg20-vpn Firmware Search vendor "Zyxel" for product "Usg20-vpn Firmware"	4.60 Search vendor "Zyxel" for product "Usg20-vpn Firmware" and version "4.60"	-	Affected	in	Zyxel Search vendor "Zyxel"	Usg20-vpn Search vendor "Zyxel" for product "Usg20-vpn"	-	-	Safe
Zyxel Search vendor "Zyxel"	Usg20w-vpn Firmware Search vendor "Zyxel" for product "Usg20w-vpn Firmware"	4.60 Search vendor "Zyxel" for product "Usg20w-vpn Firmware" and version "4.60"	-	Affected	in	Zyxel Search vendor "Zyxel"	Usg20w-vpn Search vendor "Zyxel" for product "Usg20w-vpn"	-	-	Safe
Zyxel Search vendor "Zyxel"	Usg40 Firmware Search vendor "Zyxel" for product "Usg40 Firmware"	4.60 Search vendor "Zyxel" for product "Usg40 Firmware" and version "4.60"	-	Affected	in	Zyxel Search vendor "Zyxel"	Usg40 Search vendor "Zyxel" for product "Usg40"	-	-	Safe
Zyxel Search vendor "Zyxel"	Usg40w Firmware Search vendor "Zyxel" for product "Usg40w Firmware"	4.60 Search vendor "Zyxel" for product "Usg40w Firmware" and version "4.60"	-	Affected	in	Zyxel Search vendor "Zyxel"	Usg40w Search vendor "Zyxel" for product "Usg40w"	-	-	Safe
Zyxel Search vendor "Zyxel"	Usg60 Firmware Search vendor "Zyxel" for product "Usg60 Firmware"	4.60 Search vendor "Zyxel" for product "Usg60 Firmware" and version "4.60"	-	Affected	in	Zyxel Search vendor "Zyxel"	Usg60 Search vendor "Zyxel" for product "Usg60"	-	-	Safe
Zyxel Search vendor "Zyxel"	Usg60w Firmware Search vendor "Zyxel" for product "Usg60w Firmware"	4.60 Search vendor "Zyxel" for product "Usg60w Firmware" and version "4.60"	-	Affected	in	Zyxel Search vendor "Zyxel"	Usg60w Search vendor "Zyxel" for product "Usg60w"	-	-	Safe
Zyxel Search vendor "Zyxel"	Usg110 Firmware Search vendor "Zyxel" for product "Usg110 Firmware"	4.60 Search vendor "Zyxel" for product "Usg110 Firmware" and version "4.60"	-	Affected	in	Zyxel Search vendor "Zyxel"	Usg110 Search vendor "Zyxel" for product "Usg110"	-	-	Safe
Zyxel Search vendor "Zyxel"	Usg210 Firmware Search vendor "Zyxel" for product "Usg210 Firmware"	4.60 Search vendor "Zyxel" for product "Usg210 Firmware" and version "4.60"	-	Affected	in	Zyxel Search vendor "Zyxel"	Usg210 Search vendor "Zyxel" for product "Usg210"	-	-	Safe
Zyxel Search vendor "Zyxel"	Usg310 Firmware Search vendor "Zyxel" for product "Usg310 Firmware"	4.60 Search vendor "Zyxel" for product "Usg310 Firmware" and version "4.60"	-	Affected	in	Zyxel Search vendor "Zyxel"	Usg310 Search vendor "Zyxel" for product "Usg310"	-	-	Safe
Zyxel Search vendor "Zyxel"	Usg1100 Firmware Search vendor "Zyxel" for product "Usg1100 Firmware"	4.60 Search vendor "Zyxel" for product "Usg1100 Firmware" and version "4.60"	-	Affected	in	Zyxel Search vendor "Zyxel"	Usg1100 Search vendor "Zyxel" for product "Usg1100"	-	-	Safe
Zyxel Search vendor "Zyxel"	Usg1900 Firmware Search vendor "Zyxel" for product "Usg1900 Firmware"	4.60 Search vendor "Zyxel" for product "Usg1900 Firmware" and version "4.60"	-	Affected	in	Zyxel Search vendor "Zyxel"	Usg1900 Search vendor "Zyxel" for product "Usg1900"	-	-	Safe
Zyxel Search vendor "Zyxel"	Usg2200 Firmware Search vendor "Zyxel" for product "Usg2200 Firmware"	4.60 Search vendor "Zyxel" for product "Usg2200 Firmware" and version "4.60"	-	Affected	in	Zyxel Search vendor "Zyxel"	Usg2200 Search vendor "Zyxel" for product "Usg2200"	-	-	Safe
Zyxel Search vendor "Zyxel"	Zywall110 Firmware Search vendor "Zyxel" for product "Zywall110 Firmware"	4.60 Search vendor "Zyxel" for product "Zywall110 Firmware" and version "4.60"	-	Affected	in	Zyxel Search vendor "Zyxel"	Zywall110 Search vendor "Zyxel" for product "Zywall110"	-	-	Safe
Zyxel Search vendor "Zyxel"	Zywall310 Firmware Search vendor "Zyxel" for product "Zywall310 Firmware"	4.60 Search vendor "Zyxel" for product "Zywall310 Firmware" and version "4.60"	-	Affected	in	Zyxel Search vendor "Zyxel"	Zywall310 Search vendor "Zyxel" for product "Zywall310"	-	-	Safe
Zyxel Search vendor "Zyxel"	Zywall1100 Firmware Search vendor "Zyxel" for product "Zywall1100 Firmware"	4.60 Search vendor "Zyxel" for product "Zywall1100 Firmware" and version "4.60"	-	Affected	in	Zyxel Search vendor "Zyxel"	Zywall1100 Search vendor "Zyxel" for product "Zywall1100"	-	-	Safe