CVE-2020-29583: Zyxel Multiple Products Use of Hard-Coded Credentials Vulnerability
Critical · CVSS 9.8 (CVSS 3.1)KEV known exploitedEPSS 90.2%, 100th percentilePublished Updated Assigner: mitre
In CISA’s Known Exploited Vulnerabilities catalog: Zyxel Multiple Products Use of Hard-Coded Credentials Vulnerability.
Added , federal remediation due . Known ransomware use: Unknown.
Required action: Apply updates per vendor instructions.
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.
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
Zyxel: Multiple Products
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- ftp.zyxel.com/USG40/firmware/USG40_4.60%28AALA.1%29C0_2.pdf (opens in new tab)
- businessforum.zyxel.com/discussion/5252/zld-v4-60-revoke-and-wk48-firmware-release (opens in new tab)
- businessforum.zyxel.com/discussion/5254/whats-new-for-zld4-60-patch-1-available-on-dec-15 (opens in new tab)
- www.eyecontrol.nl/blog/undocumented-user-account-in-zyxel-products.html (opens in new tab)
- www.secpod.com/blog/a-secret-zyxel-firewall-and-ap-controllers-could-allow-for-admin… (opens in new tab)
- www.zyxel.com/support/CVE-2020-29583.shtml (opens in new tab)
- www.zyxel.com/support/security_advisories.shtml (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)