CVE-2022-0342

CRITICAL EXPLOITED NUCLEI

Zyxel USG/ZyWALL - Auth Bypass

Title source: llm

Description

An authentication bypass vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.20 through 4.70, USG FLEX series firmware versions 4.50 through 5.20, ATP series firmware versions 4.32 through 5.20, VPN series firmware versions 4.30 through 5.20, and NSG series firmware versions V1.20 through V1.33 Patch 4, which could allow an attacker to bypass the web authentication and obtain administrative access of the device.

Nuclei Templates (1)

Zyxel - Authentication Bypass

CRITICALVERIFIEDby SleepingBag945,Powerexploit

FOFA: body="/2FA-access.cgi" && body="zyxel zyxel_style1" || body="/2fa-access.cgi" && body="zyxel zyxel_style1"

References (1)

[Vendor Advisory] https://www.zyxel.com/support/Zyxel-security-advisory-for-authentication-bypass-vulnerability-of-firewalls.shtml

Scores

CVSS v3 9.8

EPSS 0.9236

EPSS Percentile 99.7%

Attack Vector NETWORK

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

Details

VulnCheck KEV 2025-10-17

CWE

CWE-287

Status published

Products (24)

zyxel/atp100_firmware 4.32 - 5.20

zyxel/atp100w_firmware 4.32 - 5.20

zyxel/atp200_firmware 4.32 - 5.20

zyxel/atp500_firmware 4.32 - 5.20

zyxel/atp700_firmware 4.32 - 5.20

zyxel/atp800_firmware 4.32 - 5.20

zyxel/nsg300_firmware 1.33 (2 CPE variants)

zyxel/nsg300_firmware 1.20 - 1.33

zyxel/usg40_firmware 4.20 - 4.71

zyxel/usg40w_firmware 4.20 - 4.71

... and 14 more

Published Mar 28, 2022

Tracked Since Feb 18, 2026