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CVE-2022-0910

MEDIUM
6.5
CVSS Score
Published: May 24, 2022 at 02:20 AM UTC
Updated: June 17, 2026 at 04:21 AM UTC
69 products affected across 1 vendorUsg Flex 100W FirmwareUSG FLEX 200 firmwareUSG FLEX 700 firmware

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.7%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

ATP100 Firmware· Zyxel
95%
4.32 ≤ v ≤ 5.21
ATP100W Firmware· Zyxel
95%
4.32 ≤ v ≤ 5.21
zyxel-atp100w (same device)
ATP200 Firmware· Zyxel
95%
4.32 ≤ v ≤ 5.21
zyxel-atp200 (same device)
ATP500 Firmware· Zyxel
95%
4.32 ≤ v ≤ 5.21
zyxel-atp500 (same device)
ATP700 Firmware· Zyxel
95%
4.32 ≤ v ≤ 5.21
zyxel-atp700 (same device)
ATP800 Firmware· Zyxel
95%
4.32 ≤ v ≤ 5.21
zyxel-atp800 (same device)
Usg 20W Firmware· Zyxel
95%
4.32 ≤ v ≤ 4.71
zyxel-usg-20w (same device)
Usg 20W VPN Firmware· Zyxel
95%
4.32 ≤ v ≤ 4.71
Usg 2200-vpn Firmware· Zyxel
95%
4.32 ≤ v ≤ 4.71
zyxel-usg-2200-vpn (same device)
Usg Flex 100 Firmware· Zyxel
95%
4.50 ≤ v ≤ 5.21
zyxel-usg-flex-100 (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://www.zyxel.com/support/multiple-vulnerabilities-of-firewalls-AP-controllers-and-APs.shtml

CVSS

6.5MEDIUMZyxel
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-287

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