Authentication Bypass Vulnerability in Zyxel Firewalls
CVE-2022-0342

9.8CRITICAL

Key Information:

Vendor

Zyxel
Status
Usg/zywall Series Firmware
Usg Flex Series Firmware
Atp Series Firmware
Vpn Series Firmware
Vendor
CVE Published:
28 March 2022

What is CVE-2022-0342?

This vulnerability exists in the CGI program of Zyxel's various firewall series, enabling attackers to circumvent web authentication and gain unauthorized administrative access. Affected devices include the USG/ZyWALL, USG FLEX, ATP, VPN, and NSG series, spanning multiple firmware versions. Timely updates and security measures are essential to safeguard against potential exploits.

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Deploy the Patch

Affected Version(s)

ATP series firmware 4.32 through 5.20

NSG series firmware 1.20 through 1.33 Patch 4

USG FLEX series firmware 4.50 through 5.20

References

https://www.zyxel.com/support/Zyxel-security-advisory-for...
x_refsource_CONFIRM

EPSS Score

91% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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