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Zyxel "zyfwp" Backdoor Account (Hardcoded Credential)

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Zyxel "zyfwp" Backdoor Account (Hardcoded Credential)

Severity
10
CVSS
(AV:N/AC:L/Au:N/C:C/I:C/A:C)
Published
12/23/2020
Created
01/06/2021
Added
01/04/2021
Modified
05/03/2022

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.

Solution(s)

  • zyxel-upgrade-460-610-patch1

References

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