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CVE

CWE

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CVE-2020-29583

Published: Dec 22, 2020

Modified: Oct 21, 2025

PUBLISHED

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.

Vendor	Product	Versions
n/a	n/a	affected `n/a`

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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