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Status published
Unknown
CVE-2020-29583
Firmware version 4.60 of Zyxel USG devices contains an undocumented...
Vulnerability Description
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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
No credits recorded in the NVD database.
References
- https://www.zyxel.com/support/security_advisories.shtml
- http://ftp.zyxel.com/USG40/firmware/USG40_4.60%28AALA.1%29C0_2.pdf
- https://businessforum.zyxel.com/discussion/5254/whats-new-for-zld4-60-patch-1-available-on-dec-15
- https://businessforum.zyxel.com/discussion/5252/zld-v4-60-revoke-and-wk48-firmware-release
- https://www.eyecontrol.nl/blog/undocumented-user-account-in-zyxel-products.html
- https://www.zyxel.com/support/CVE-2020-29583.shtml
- https://www.secpod.com/blog/a-secret-zyxel-firewall-and-ap-controllers-could-allow-for-administrative-access-cve-2020-29583/
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Affected Vendor
zyxel
View all reports →Affected Software
usg20-vpn firmware, usg20w-vpn firmware, usg40 firmware, usg40w firmware, usg60 firmware, usg60w firmware, usg110 firmware, usg210 firmware, usg310 firmware, usg1100 firmware, usg1900 firmware, usg2200 firmware, zywall110 firmware, zywall310 firmware, zywall1100 firmware, atp100 firmware, atp100w firmware, atp200 firmware, atp500 firmware, atp700 firmware, atp800 firmware, vpn50 firmware, vpn100 firmware, vpn300 firmware, vpn1000 firmware, usg flex 100 firmware, usg flex 100w firmware, usg flex 200 firmware, usg flex 500 firmware, usg flex 700 firmware
Vulnerable Versions:
4.60
Timeline
Official Publish:
December 22nd, 2020
Last Modified:
October 21st, 2025
Added to House:
July 21st, 2026
CVSS Vectors
No vector data available
Weaknesses (CWE)
No CWE data available
MITRE ATT&CK TTPs
No associated TTPs found for this vulnerability.