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CVE-2021-35033

nvd nist
Published: Nov 23, 2021Modified: Jun 17, 2026

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7.8
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability: 1.8 / Impact: 5.9
Source: NVD

Description

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.

Affected (6)

Zyxel
6 products
Nbg6818 Firmware
Nbg7815 Firmware
Wsq20 Firmware
Wsq50 Firmware
Wsq60 Firmware
Wsr30 Firmware
Configuration A
1 vulnerable · 1 platform
Vulnerable SoftwareAffected Versions
Nbg6818 Firmware
Before 1.00\(absc.5\)c0
Running on/withPlatform Versions
Zyxel
Nbg6818
All versions
Configuration B
1 vulnerable · 1 platform
Vulnerable SoftwareAffected Versions
Nbg7815 Firmware
Before 1.00\(absk.7\)c0
Running on/withPlatform Versions
Zyxel
Nbg7815
All versions
Configuration C
1 vulnerable · 1 platform
Vulnerable SoftwareAffected Versions
Wsq20 Firmware
Before 1.00\(abof.11\)c0
Running on/withPlatform Versions
Zyxel
Wsq20
All versions
Configuration D
1 vulnerable · 1 platform
Vulnerable SoftwareAffected Versions
Wsq50 Firmware
Before 2.20\(abkj.7\)c0
Running on/withPlatform Versions
Zyxel
Wsq50
All versions
Configuration E
1 vulnerable · 1 platform
Vulnerable SoftwareAffected Versions
Wsq60 Firmware
Before 2.20\(abnd.8\)c0
Running on/withPlatform Versions
Zyxel
Wsq60
All versions
Configuration F
1 vulnerable · 1 platform
Vulnerable SoftwareAffected Versions
Wsr30 Firmware
Before 1.00\(abmy.12\)c0
Running on/withPlatform Versions
Zyxel
Wsr30
All versions

Related CWEs

CWE-260
Password in Configuration File
The product stores a password in a configuration file that might be accessible to actors who do not know the password.
CWE-287
Improper Authentication
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

References (4)

Source: security@zyxel.com.tw
ExploitThird Party Advisory
Source: security@zyxel.com.tw
Vendor Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
ExploitThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Vendor Advisory

Timeline

No history available yet.