Improper authentication in Zyxel USG/ZyWALL series firmware
Priority LOW 30CWE-287Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-287.
Summary
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.
Why it matters now
EPSS 0.0074 54th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Zyxel | USG/ZyWALL series firmware | 4.32 through 4.71 | — | No fix listed | CNA |
| Zyxel | USG FLEX series firmware | 4.50 through 5.21 | — | No fix listed | CNA |
| Zyxel | ATP series firmware | 4.32 through 5.21 | — | No fix listed | CNA |
| Zyxel | VPN series firmware | 4.32 through 5.21 | — | No fix listed | CNA |
- USG/ZyWALL series firmware VendorZyxel Affected 4.32 through 4.71 Fixed in — No fix listed CNA
- USG FLEX series firmware VendorZyxel Affected 4.50 through 5.21 Fixed in — No fix listed CNA
- ATP series firmware VendorZyxel Affected 4.32 through 5.21 Fixed in — No fix listed CNA
- VPN series firmware VendorZyxel Affected 4.32 through 5.21 Fixed in — No fix listed CNA
CPE configurations NVD · 64
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:zyxel:vpn100_firmware:*:*:*:*:*:*:*:* | 4.32 – 5.21 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:vpn100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:vpn1000_firmware:*:*:*:*:*:*:*:* | 4.32 – 5.21 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:vpn1000:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:vpn300_firmware:*:*:*:*:*:*:*:* | 4.32 – 5.21 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:vpn300:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:vpn50_firmware:*:*:*:*:*:*:*:* | 4.32 – 5.21 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:vpn50:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:atp100_firmware:*:*:*:*:*:*:*:* | 4.32 – 5.21 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:atp100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
- cpe:2.3:o:zyxel:vpn100_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 5.21 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:vpn100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:vpn1000_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 5.21 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:vpn1000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:vpn300_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 5.21 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:vpn300:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:vpn50_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 5.21 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:vpn50:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:atp100_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 5.21 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:atp100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
Show 54 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:zyxel:atp100w_firmware:*:*:*:*:*:*:*:* | 4.32 – 5.21 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:atp100w:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:atp200_firmware:*:*:*:*:*:*:*:* | 4.32 – 5.21 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:atp200:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:atp500_firmware:*:*:*:*:*:*:*:* | 4.32 – 5.21 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:atp500:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:atp700_firmware:*:*:*:*:*:*:*:* | 4.32 – 5.21 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:atp700:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:atp800_firmware:*:*:*:*:*:*:*:* | 4.32 – 5.21 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:atp800:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg_110_firmware:*:*:*:*:*:*:*:* | 4.32 – 4.71 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg_110:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg_1100_firmware:*:*:*:*:*:*:*:* | 4.32 – 4.71 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg_1100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg_1900_firmware:*:*:*:*:*:*:*:* | 4.32 – 4.71 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg_1900:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg_20w_firmware:*:*:*:*:*:*:*:* | 4.32 – 4.71 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg_20w:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg_20w-vpn_firmware:*:*:*:*:*:*:*:* | 4.32 – 4.71 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg_20w-vpn:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg_2200-vpn_firmware:*:*:*:*:*:*:*:* | 4.32 – 4.71 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg_2200-vpn:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg_310_firmware:*:*:*:*:*:*:*:* | 4.32 – 4.71 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg_310:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg_40_firmware:*:*:*:*:*:*:*:* | 4.32 – 4.71 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg_40:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg_40w_firmware:*:*:*:*:*:*:*:* | 4.32 – 4.71 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg_40w:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg_60_firmware:*:*:*:*:*:*:*:* | 4.32 – 4.71 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg_60:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg_60w_firmware:*:*:*:*:*:*:*:* | 4.32 – 4.71 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg_60w:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg_flex_100_firmware:*:*:*:*:*:*:*:* | 4.50 – 5.21 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg_flex_100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg_flex_100w_firmware:*:*:*:*:*:*:*:* | 4.50 – 5.21 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg_flex_100w:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg_flex_200_firmware:*:*:*:*:*:*:*:* | 4.50 – 5.21 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg_flex_200:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg_flex_500_firmware:*:*:*:*:*:*:*:* | 4.50 – 5.21 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg_flex_500:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg_flex_700_firmware:*:*:*:*:*:*:*:* | 4.50 – 5.21 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg_flex_700:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg200_firmware:*:*:*:*:*:*:*:* | 4.32 – 4.71 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg200:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg20_firmware:*:*:*:*:*:*:*:* | 4.32 – 4.71 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg20:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg210_firmware:*:*:*:*:*:*:*:* | 4.32 – 4.71 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg210:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg2200_firmware:*:*:*:*:*:*:*:* | 4.32 – 4.71 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg2200:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg300_firmware:*:*:*:*:*:*:*:* | 4.32 – 4.71 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg300:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg310_firmware:*:*:*:*:*:*:*:* | 4.32 – 4.71 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg310:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
- cpe:2.3:o:zyxel:atp100w_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 5.21 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:atp100w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:atp200_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 5.21 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:atp200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:atp500_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 5.21 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:atp500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:atp700_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 5.21 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:atp700:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:atp800_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 5.21 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:atp800:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg_110_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 4.71 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg_110:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg_1100_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 4.71 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg_1100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg_1900_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 4.71 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg_1900:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg_20w_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 4.71 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg_20w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg_20w-vpn_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 4.71 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg_20w-vpn:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg_2200-vpn_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 4.71 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg_2200-vpn:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg_310_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 4.71 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg_310:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg_40_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 4.71 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg_40:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg_40w_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 4.71 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg_40w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg_60_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 4.71 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg_60:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg_60w_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 4.71 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg_60w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg_flex_100_firmware:*:*:*:*:*:*:*:* Versions 4.50 – 5.21 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg_flex_100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg_flex_100w_firmware:*:*:*:*:*:*:*:* Versions 4.50 – 5.21 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg_flex_100w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg_flex_200_firmware:*:*:*:*:*:*:*:* Versions 4.50 – 5.21 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg_flex_200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg_flex_500_firmware:*:*:*:*:*:*:*:* Versions 4.50 – 5.21 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg_flex_500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg_flex_700_firmware:*:*:*:*:*:*:*:* Versions 4.50 – 5.21 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg_flex_700:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg200_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 4.71 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg20_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 4.71 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg20:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg210_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 4.71 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg210:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg2200_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 4.71 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg2200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg300_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 4.71 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg300:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg310_firmware:*:*:*:*:*:*:*:* Versions 4.32 – 4.71 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg310:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2022-0910
- 2026-10-03 Alias added: GHSA-mv2h-6cx9-44g2
References
More Zyxel Atp100 Firmware vulnerabilities
- TI-2023-16198 Buffer overflow in Zyxel ATP series firmware KEVCVSS 3.1CRITICAL 9.8
- TI-2023-16197 Buffer overflow in Zyxel ATP series firmware KEVCVSS 3.1CRITICAL 9.8
- TI-2023-13281 OS command injection in Zyxel ZyWALL/USG series firmware KEVCVSS 3.1CRITICAL 9.8
- TI-2022-12682 OS command injection in Zyxel USG FLEX 100 firmware KEVCVSS 3.1CRITICAL 9.8
- TI-2020-17772 Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with… KEVCVSS 3.1CRITICAL 9.8
- TI-2020-07267 OS command injection in Zyxel NAS326 KEVCVSS 3.1CRITICAL 9.8
Sources
- CVE-2022-0910 · CVE Program
- CVE-2022-0910 · NVD
- FIRST EPSS
- GHSA-mv2h-6cx9-44g2 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences