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.

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

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
n/a n/a affected
Version Status Constraints
n/a affected —

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.

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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 00:30:00 +0000

Type Values Removed Values Added
References

Tue, 21 Oct 2025 20:30:00 +0000

Type Values Removed Values Added
References

Tue, 21 Oct 2025 19:30:00 +0000

Type Values Removed Values Added
References

Mon, 10 Feb 2025 23:15:00 +0000

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'}

Tue, 04 Feb 2025 21:15:00 +0000

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