Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with an unchangeable password. The password for this account can be found in cleartext in the firmware. This account can be used by someone to login to the ssh server or web interface with admin privileges.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact Complete

Integrity Impact Complete

Availability Impact Complete

This CVE is in the KEV database since Nov. 3, 2021.

The EPSS score is 0.94367.

Exploitation active

Automatable yes

Technical Impact total

Affected Vendors & Products

Vendors Products
Zyxel Subscribe
Atp100 Subscribe
Atp100 Firmware Subscribe
Atp100w Subscribe
Atp100w Firmware Subscribe
Atp200 Subscribe
Atp200 Firmware Subscribe
Atp500 Subscribe
Atp500 Firmware Subscribe
Atp700 Subscribe
Atp700 Firmware Subscribe
Atp800 Subscribe
Atp800 Firmware Subscribe
Usg110 Subscribe
Usg1100 Subscribe
Usg1100 Firmware Subscribe
Usg110 Firmware Subscribe
Usg1900 Subscribe
Usg1900 Firmware Subscribe
Usg20-vpn Subscribe
Usg20-vpn Firmware Subscribe
Usg20w-vpn Subscribe
Usg20w-vpn Firmware Subscribe
Usg210 Subscribe
Usg210 Firmware Subscribe
Usg2200 Subscribe
Usg2200 Firmware Subscribe
Usg310 Subscribe
Usg310 Firmware Subscribe
Usg40 Subscribe
Usg40 Firmware Subscribe
Usg40w Subscribe
Usg40w Firmware Subscribe
Usg60 Subscribe
Usg60 Firmware Subscribe
Usg60w Subscribe
Usg60w Firmware Subscribe
Usg Flex 100 Subscribe
Usg Flex 100 Firmware Subscribe
Usg Flex 100w Subscribe
Usg Flex 100w Firmware Subscribe
Usg Flex 200 Subscribe
Usg Flex 200 Firmware Subscribe
Usg Flex 500 Subscribe
Usg Flex 500 Firmware Subscribe
Usg Flex 700 Subscribe
Usg Flex 700 Firmware Subscribe
Vpn100 Subscribe
Vpn1000 Subscribe
Vpn1000 Firmware Subscribe
Vpn100 Firmware Subscribe
Vpn300 Subscribe
Vpn300 Firmware Subscribe
Vpn50 Subscribe
Vpn50 Firmware Subscribe
Zywall110 Subscribe
Zywall1100 Subscribe
Zywall1100 Firmware Subscribe
Zywall110 Firmware Subscribe
Zywall310 Subscribe
Zywall310 Firmware Subscribe

Configuration 1 [-]

AND
cpe:2.3:o:zyxel:usg20-vpn_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg20-vpn:-:*:*:*:*:*:*:*

Configuration 2 [-]

AND
cpe:2.3:o:zyxel:usg20w-vpn_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg20w-vpn:-:*:*:*:*:*:*:*

Configuration 3 [-]

AND
cpe:2.3:o:zyxel:usg40_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg40:-:*:*:*:*:*:*:*

Configuration 4 [-]

AND
cpe:2.3:o:zyxel:usg40w_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg40w:-:*:*:*:*:*:*:*

Configuration 5 [-]

AND
cpe:2.3:o:zyxel:usg60_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg60:-:*:*:*:*:*:*:*

Configuration 6 [-]

AND
cpe:2.3:o:zyxel:usg60w_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg60w:-:*:*:*:*:*:*:*

Configuration 7 [-]

AND
cpe:2.3:o:zyxel:usg110_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg110:-:*:*:*:*:*:*:*

Configuration 8 [-]

AND
cpe:2.3:o:zyxel:usg210_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg210:-:*:*:*:*:*:*:*

Configuration 9 [-]

AND
cpe:2.3:o:zyxel:usg310_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg310:-:*:*:*:*:*:*:*

Configuration 10 [-]

AND
cpe:2.3:o:zyxel:usg1100_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg1100:-:*:*:*:*:*:*:*

Configuration 11 [-]

AND
cpe:2.3:o:zyxel:usg1900_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg1900:-:*:*:*:*:*:*:*

Configuration 12 [-]

AND
cpe:2.3:o:zyxel:usg2200_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg2200:-:*:*:*:*:*:*:*

Configuration 13 [-]

AND
cpe:2.3:o:zyxel:zywall110_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:zywall110:-:*:*:*:*:*:*:*

Configuration 14 [-]

AND
cpe:2.3:o:zyxel:zywall310_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:zywall310:-:*:*:*:*:*:*:*

Configuration 15 [-]

AND
cpe:2.3:o:zyxel:zywall1100_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:zywall1100:-:*:*:*:*:*:*:*

Configuration 16 [-]

AND
cpe:2.3:o:zyxel:atp100_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:atp100:-:*:*:*:*:*:*:*

Configuration 17 [-]

AND
cpe:2.3:o:zyxel:atp100w_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:atp100w:-:*:*:*:*:*:*:*

Configuration 18 [-]

AND
cpe:2.3:o:zyxel:atp200_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:atp200:-:*:*:*:*:*:*:*

Configuration 19 [-]

AND
cpe:2.3:o:zyxel:atp500_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:atp500:-:*:*:*:*:*:*:*

Configuration 20 [-]

AND
cpe:2.3:o:zyxel:atp700_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:atp700:-:*:*:*:*:*:*:*

Configuration 21 [-]

AND
cpe:2.3:o:zyxel:atp800_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:atp800:-:*:*:*:*:*:*:*

Configuration 22 [-]

AND
cpe:2.3:o:zyxel:vpn50_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vpn50:-:*:*:*:*:*:*:*

Configuration 23 [-]

AND
cpe:2.3:o:zyxel:vpn100_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vpn100:-:*:*:*:*:*:*:*

Configuration 24 [-]

AND
cpe:2.3:o:zyxel:vpn300_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vpn300:-:*:*:*:*:*:*:*

Configuration 25 [-]

AND
cpe:2.3:o:zyxel:vpn1000_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vpn1000:-:*:*:*:*:*:*:*

Configuration 26 [-]

AND
cpe:2.3:o:zyxel:usg_flex_100_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg_flex_100:-:*:*:*:*:*:*:*

Configuration 27 [-]

AND
cpe:2.3:o:zyxel:usg_flex_100w_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg_flex_100w:-:*:*:*:*:*:*:*

Configuration 28 [-]

AND
cpe:2.3:o:zyxel:usg_flex_200_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg_flex_200:-:*:*:*:*:*:*:*

Configuration 29 [-]

AND
cpe:2.3:o:zyxel:usg_flex_500_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg_flex_500:-:*:*:*:*:*:*:*

Configuration 30 [-]

AND
cpe:2.3:o:zyxel:usg_flex_700_firmware:4.60:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:usg_flex_700:-:*:*:*:*:*:*:*

No data.

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
http://ftp.zyxel.com/USG40/firmware/USG40_4.60%28AALA.1%29C0_2.pdf cve-icon cve-icon
https://businessforum.zyxel.com/discussion/5252/zld-v4-60-revoke-and-wk48-firmware-release cve-icon cve-icon
https://businessforum.zyxel.com/discussion/5254/whats-new-for-zld4-60-patch-1-available-on-dec-15 cve-icon cve-icon
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-29583 cve-icon
https://www.eyecontrol.nl/blog/undocumented-user-account-in-zyxel-products.html cve-icon cve-icon
https://www.secpod.com/blog/a-secret-zyxel-firewall-and-ap-controllers-could-allow-for-administrative-access-cve-2020-29583/ cve-icon cve-icon
https://www.zyxel.com/support/CVE-2020-29583.shtml cve-icon cve-icon
https://www.zyxel.com/support/security_advisories.shtml cve-icon cve-icon
History

Wed, 22 Oct 2025 09:30:00 +0900

Type Values Removed Values Added
References

Wed, 22 Oct 2025 05:30:00 +0900

Type Values Removed Values Added
References

Wed, 22 Oct 2025 04:30:00 +0900

Type Values Removed Values Added
References

Tue, 11 Feb 2025 08:15:00 +0900

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

 ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 05 Feb 2025 06:15:00 +0900

Type Values Removed Values Added
Metrics kev

{'dateAdded': '2021-11-03'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2025-10-21T23:35:31.245Z

Reserved: 2020-12-06T00:00:00.000Z

Link: CVE-2020-29583

cve-icon Vulnrichment

Updated: 2024-08-04T16:55:10.633Z

cve-icon NVD

Status : Analyzed

Published: 2020-12-22T22:15:14.443

Modified: 2025-11-07T22:03:10.220

Link: CVE-2020-29583

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses