CVE-2022-0910

Home/CVE/A downgrade from two-factor authentication to one-factor authentication vulnerability in the CGI program of Zyxel USG/Zy

CVE

A downgrade from two-factor authentication to one-factor authentication vulnerability in the CGI program of Zyxel USG/Zy

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.

MEDIUM · CVSS 6.5 EPSS 0.00152

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No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence

Sigma rules0 YARA rules0

⬡

Weakness Classification

CWE-287Improper Authentication

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Affected Products & Versions

zyxel vpn100 firmware>= 4.32 and <= 5.21
zyxel vpn1000 firmware>= 4.32 and <= 5.21
zyxel vpn300 firmware>= 4.32 and <= 5.21
zyxel vpn50 firmware>= 4.32 and <= 5.21
zyxel atp100 firmware>= 4.32 and <= 5.21
zyxel atp100w firmware>= 4.32 and <= 5.21
zyxel atp200 firmware>= 4.32 and <= 5.21
zyxel atp500 firmware>= 4.32 and <= 5.21
Show all 32 affected productszyxel atp700 firmware>= 4.32 and <= 5.21
zyxel atp800 firmware>= 4.32 and <= 5.21
zyxel usg 110 firmware>= 4.32 and <= 4.71
zyxel usg 1100 firmware>= 4.32 and <= 4.71
zyxel usg 1900 firmware>= 4.32 and <= 4.71
zyxel usg 20w firmware>= 4.32 and <= 4.71
zyxel usg 20w-vpn firmware>= 4.32 and <= 4.71
zyxel usg 2200-vpn firmware>= 4.32 and <= 4.71
zyxel usg 310 firmware>= 4.32 and <= 4.71
zyxel usg 40 firmware>= 4.32 and <= 4.71
zyxel usg 40w firmware>= 4.32 and <= 4.71
zyxel usg 60 firmware>= 4.32 and <= 4.71
zyxel usg 60w firmware>= 4.32 and <= 4.71
zyxel usg flex 100 firmware>= 4.50 and <= 5.21
zyxel usg flex 100w firmware>= 4.50 and <= 5.21
zyxel usg flex 200 firmware>= 4.50 and <= 5.21
zyxel usg flex 500 firmware>= 4.50 and <= 5.21
zyxel usg flex 700 firmware>= 4.50 and <= 5.21
zyxel usg200 firmware>= 4.32 and <= 4.71
zyxel usg20 firmware>= 4.32 and <= 4.71
zyxel usg210 firmware>= 4.32 and <= 4.71
zyxel usg2200 firmware>= 4.32 and <= 4.71
zyxel usg300 firmware>= 4.32 and <= 4.71
zyxel usg310 firmware>= 4.32 and <= 4.71

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Scoring & Timeline

6.5

MEDIUM · CVSS v3.1 · security@zyxel.com.tw

View on NVD

Attack Vector

Network Adjacent Local Physical

Attack Complexity

Low High

Privileges Required

None Low High

User Interaction

None Required

Scope

Unchanged Changed

Confidentiality

None Low High

Integrity

None Low High

Availability

None Low High

Published to NVD24 May 2022 · 03:15 AM

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

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References & Sources

Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.

https://www.zyxel.com/support/multiple-vulnerabilities-of-firewalls-AP-controllers-and-APs.shtmlVendor Advisory

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