← Vulnerability feed

Vulnerability record · CVE-2022-0910 · published 24 May 2022

CVE-2022-0910: Zyxel vpn100 firmware improper authentication vulnerability

Zyxel · Vpn100 Firmware

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.

6.5 CVSS 3.1 Medium EPSS 0.72% · top 47.7% CWE-287 · Improper authentication
6.5CVSS 3.1 base score, v2 4.0
0.72%EPSS exploitation probability, 30 days
NoNot in CISA KEV
32Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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

Affected products

32 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

Track CVE-2022-0910 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-33009Zyxel firewall notification function buffer overflowA buffer overflow in the notification function of multiple Zyxel firewall and VPN firmware lines (ATP, USG FLEX, USG20(W)-VPN, VPN, ZyWALL/USG) allow…KEVEPSS 28%analysed9.8CVE-2023-33010Zyxel firewall ID processing buffer overflow allows unauthenticated RCEA classic buffer overflow (CWE-120) exists in the ID processing function of multiple Zyxel firewall firmware lines, including ATP, USG FLEX, USG20(W)…KEVEPSS 29%analysed9.8CVE-2023-28771Zyxel firewall firmware OS command injection via crafted packetsZyxel ZyWALL/USG, VPN, USG FLEX and ATP series firmware mishandle error messages, allowing OS command injection. An unauthenticated remote attacker c…KEVEPSS 99%analysed9.8CVE-2022-30525Zyxel firewall CGI OS command injectionThe CGI program in multiple Zyxel firewall and VPN firmware lines fails to neutralize OS command syntax, allowing command injection. The flaw affects…KEVEPSS 100%analysed9.8CVE-2020-29583Zyxel USG and ATP firmware hard-coded admin credentialZyxel USG and ATP firmware version 4.60 ships an undocumented account (zyfwp) whose password is stored in cleartext in the firmware and cannot be cha…KEVEPSS 90%analysed9.8CVE-2020-9054ZyXEL NAS weblogin.cgi pre-auth command injectionZyXEL NAS devices running firmware 5.21 fail to sanitize the username parameter in the weblogin.cgi CGI executable, allowing OS command injection. Be…KEVEPSS 100%analysed9.8CVE-2022-0342Zyxel firewall CGI authentication bypass grants admin accessThe CGI program in multiple Zyxel firewall firmware lines (USG/ZyWALL, USG FLEX, ATP, VPN, NSG) fails to properly enforce authentication, allowing a …EPSS 95%analysed8.8CVE-2023-27991Zyxel atp200 firmware os command injection vulnerabilityThe post-authentication command injection vulnerability in the CLI command of Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX series f…EPSS 1.5%

Source: NIST National Vulnerability Database (record CVE-2022-0910), CISA KEV, FIRST EPSS (scores of 2026-10-09). This page is refreshed as NVD updates the record.