Critical severity · published Mar 28, 2022
CVE-2022-0342
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…
9.8
CVSS
95.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)95.1% · higher than 100% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AF
Atp100 Firmware · Zyxel
4.32 through 5.20 · source: NVD
AF
Atp100w Firmware · Zyxel
4.32 through 5.20 · source: NVD
AF
Atp200 Firmware · Zyxel
4.32 through 5.20 · source: NVD
AF
Atp500 Firmware · Zyxel
4.32 through 5.20 · source: NVD
AF
Atp700 Firmware · Zyxel
4.32 through 5.20 · source: NVD
AF
Atp800 Firmware · Zyxel
4.32 through 5.20 · source: NVD
NF
Nsg300 Firmware · Zyxel
1.20 before 1.33; 1.33; 1.33 · source: NVD
UF
Usg Flex 100 Firmware · Zyxel
4.50 through 5.20 · source: NVD
UF
Usg Flex 100w Firmware · Zyxel
4.50 through 5.20 · source: NVD
UF
Usg Flex 200 Firmware · Zyxel
4.50 through 5.20 · source: NVD
UF
Usg Flex 500 Firmware · Zyxel
4.50 through 5.20 · source: NVD
UF
Usg Flex 700 Firmware · Zyxel
4.50 through 5.20 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-0342
CVE.org
https://www.cve.org/CVERecord?id=CVE-2022-0342
Vendor Advisory
https://www.zyxel.com/support/Zyxel-security-advisory-for-authentication-bypass-vulnerability-of-firewalls.shtml
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