CVE-2022-0342

Name: CVE-2022-0342
Creator: NVD / NIST
Published: 2022-03-28T13:15:07.747+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 84.84%

Last modified Jun 17, 2026

CVE-2022-0342 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 84.84% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

84.84%

99.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Zyxel	Usg40 Firmware	>= 4.20, < 4.71
Zyxel	Usg40w Firmware	>= 4.20, < 4.71
Zyxel	Usg60 Firmware	>= 4.20, < 4.71
Zyxel	Usg60w Firmware	>= 4.20, < 4.71
Zyxel	Zywall 110 Firmware	>= 4.20, < 4.71
Zyxel	Zywall 310 Firmware	>= 4.20, < 4.71
Zyxel	Zywall 1100 Firmware	>= 4.20, < 4.71
Zyxel	Usg Flex 100 Firmware	>= 4.50, <= 5.20
Zyxel	Usg Flex 200 Firmware	>= 4.50, <= 5.20
Zyxel	Usg Flex 500 Firmware	>= 4.50, <= 5.20
Zyxel	Usg Flex 100w Firmware	>= 4.50, <= 5.20
Zyxel	Usg Flex 700 Firmware	>= 4.50, <= 5.20
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	Vpn50 Firmware	>= 4.30, < 5.21
Zyxel	Vpn100 Firmware	>= 4.30, < 5.21
Zyxel	Vpn300 Firmware	>= 4.30, < 5.21
Zyxel	Vpn1000 Firmware	>= 4.30, < 5.21
Zyxel	Nsg300 Firmware	>= 1.20, < 1.33
Zyxel	Nsg300 Firmware	1.33

References

Timeline

Published: Mar 28, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-0342?

How severe is CVE-2022-0342?

CVE-2022-0342 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 84.84% probability of exploitation in the next 30 days.

How do I fix CVE-2022-0342?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-0342?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST