Medium severity · published May 24, 2022
CVE-2022-0910
A downgrade from two-factor authentication to one-factor authentication vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.32 through 4.71, USG FLEX…
6.5
CVSS
0.7%
EPSS
No
On KEV
Description
A downgrade from two-factor authentication to one-factor authentication vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.32 through 4.71, USG FLEX series firmware versions 4.50 through 5.21, ATP series firmware versions 4.32 through 5.21, and VPN series firmware versions 4.32 through 5.21, that could allow an authenticated attacker to bypass the second authentication phase to connect the IPsec VPN server even though the two-factor authentication (2FA) was enabled.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 54% 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 5.21 · source: NVD
AF
Atp100w Firmware · Zyxel
4.32 through 5.21 · source: NVD
AF
Atp200 Firmware · Zyxel
4.32 through 5.21 · source: NVD
AF
Atp500 Firmware · Zyxel
4.32 through 5.21 · source: NVD
AF
Atp700 Firmware · Zyxel
4.32 through 5.21 · source: NVD
AF
Atp800 Firmware · Zyxel
4.32 through 5.21 · source: NVD
U1
Usg 110 Firmware · Zyxel
4.32 through 4.71 · source: NVD
U1
Usg 1100 Firmware · Zyxel
4.32 through 4.71 · source: NVD
U1
Usg 1900 Firmware · Zyxel
4.32 through 4.71 · source: NVD
U2
Usg 20w Firmware · Zyxel
4.32 through 4.71 · source: NVD
U2
Usg 20w-vpn Firmware · Zyxel
4.32 through 4.71 · source: NVD
U2
Usg 2200-vpn Firmware · Zyxel
4.32 through 4.71 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-0910
CVE.org
https://www.cve.org/CVERecord?id=CVE-2022-0910
Vendor Advisory
https://www.zyxel.com/support/multiple-vulnerabilities-of-firewalls-AP-controllers-and-APs.shtml
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