VULNERABILITY INTELLIGENCE

CVE-2021-35033

CVSS score7.8 HIGH

EPSS probability0.41%

CISA KEVNot currently listed

Published2021-11-23

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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.

Weakness classification

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

Primary references

security@zyxel.com.tw — Exploit, Third Party Advisory
security@zyxel.com.tw — Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Vendor Advisory