CVE-2021-35033

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A vulnerability in specific versions of Zyxel NBG6818, NBG7815, WSQ20, WSQ50, WSQ60, and WSR30 firmware with pre-configured password management could allow an attacker to obtain root access of the device, if the local attacker dismantles the device and uses a USB-to-UART cable to connect the device, or if the remote assistance feature had been enabled by an authenticated user.

Una vulnerabilidad en versiones específicas del firmware de Zyxel NBG6818, NBG7815, WSQ20, WSQ50, WSQ60 y WSR30 con administación de contraseñas preconfigurada podría permitir a un atacante obtener acceso root del dispositivo, si el atacante local desmonta el dispositivo y usa un cable USB a UART para conectarlo, o si la funcionalidad remote assistance ha sido habilitada por un usuario autenticado

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Medium

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-06-17 CVE Reserved
2021-11-23 CVE Published
2023-03-08 EPSS Updated
2024-08-04 CVE Updated
2024-08-04 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-260: Password in Configuration File
CWE-287: Improper Authentication

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC
https://www.tenable.com/security/research/tra-2022-06	2024-08-04

URL	Date	SRC

URL	Date	SRC
https://www.zyxel.com/support/Zyxel_security_advisory_for_pre-configured_password_management_vulnerability_of_home_routers_and_WiFi_systems.shtml	2022-10-27

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Zyxel Search vendor "Zyxel"	Nbg6818 Firmware Search vendor "Zyxel" for product "Nbg6818 Firmware"	< 1.00\(absc.5\)c0 Search vendor "Zyxel" for product "Nbg6818 Firmware" and version " < 1.00\(absc.5\)c0"	-	Affected	in	Zyxel Search vendor "Zyxel"	Nbg6818 Search vendor "Zyxel" for product "Nbg6818"	-	-	Safe
Zyxel Search vendor "Zyxel"	Nbg7815 Firmware Search vendor "Zyxel" for product "Nbg7815 Firmware"	< 1.00\(absk.7\)c0 Search vendor "Zyxel" for product "Nbg7815 Firmware" and version " < 1.00\(absk.7\)c0"	-	Affected	in	Zyxel Search vendor "Zyxel"	Nbg7815 Search vendor "Zyxel" for product "Nbg7815"	-	-	Safe
Zyxel Search vendor "Zyxel"	Wsq20 Firmware Search vendor "Zyxel" for product "Wsq20 Firmware"	< 1.00\(abof.11\)c0 Search vendor "Zyxel" for product "Wsq20 Firmware" and version " < 1.00\(abof.11\)c0"	-	Affected	in	Zyxel Search vendor "Zyxel"	Wsq20 Search vendor "Zyxel" for product "Wsq20"	-	-	Safe
Zyxel Search vendor "Zyxel"	Wsq50 Firmware Search vendor "Zyxel" for product "Wsq50 Firmware"	< 2.20\(abkj.7\)c0 Search vendor "Zyxel" for product "Wsq50 Firmware" and version " < 2.20\(abkj.7\)c0"	-	Affected	in	Zyxel Search vendor "Zyxel"	Wsq50 Search vendor "Zyxel" for product "Wsq50"	-	-	Safe
Zyxel Search vendor "Zyxel"	Wsq60 Firmware Search vendor "Zyxel" for product "Wsq60 Firmware"	< 2.20\(abnd.8\)c0 Search vendor "Zyxel" for product "Wsq60 Firmware" and version " < 2.20\(abnd.8\)c0"	-	Affected	in	Zyxel Search vendor "Zyxel"	Wsq60 Search vendor "Zyxel" for product "Wsq60"	-	-	Safe
Zyxel Search vendor "Zyxel"	Wsr30 Firmware Search vendor "Zyxel" for product "Wsr30 Firmware"	< 1.00\(abmy.12\)c0 Search vendor "Zyxel" for product "Wsr30 Firmware" and version " < 1.00\(abmy.12\)c0"	-	Affected	in	Zyxel Search vendor "Zyxel"	Wsr30 Search vendor "Zyxel" for product "Wsr30"	-	-	Safe