CVE-2020-29583

critical-risk
Published 2020-12-22

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.

Do I need to act?

!
94.4% chance of exploitation in next 30 days
EPSS score — higher than 6% of all CVEs
!
CISA KEV: actively exploited in the wild
On the Known Exploited Vulnerabilities catalog — federal agencies must patch
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (20)

Affected Vendors

Zyxel

References (15)

Broken Link http://ftp.zyxel.com/USG40/firmware/USG40_4.60%28AALA.1%29C0_2.pdf
Release Notes https://businessforum.zyxel.com/discussion/5252/zld-v4-60-revoke-and-wk48-firmwa...
Release Notes https://businessforum.zyxel.com/discussion/5254/whats-new-for-zld4-60-patch-1-av...
Broken Link https://www.eyecontrol.nl/blog/undocumented-user-account-in-zyxel-products.html
Exploit https://www.secpod.com/blog/a-secret-zyxel-firewall-and-ap-controllers-could-all...
Vendor Advisory https://www.zyxel.com/support/CVE-2020-29583.shtml
Vendor Advisory https://www.zyxel.com/support/security_advisories.shtml
Broken Link http://ftp.zyxel.com/USG40/firmware/USG40_4.60%28AALA.1%29C0_2.pdf
Release Notes https://businessforum.zyxel.com/discussion/5252/zld-v4-60-revoke-and-wk48-firmwa...
Release Notes https://businessforum.zyxel.com/discussion/5254/whats-new-for-zld4-60-patch-1-av...
Broken Link https://www.eyecontrol.nl/blog/undocumented-user-account-in-zyxel-products.html
Exploit https://www.secpod.com/blog/a-secret-zyxel-firewall-and-ap-controllers-could-all...
Vendor Advisory https://www.zyxel.com/support/CVE-2020-29583.shtml
Vendor Advisory https://www.zyxel.com/support/security_advisories.shtml
US Government Resource https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-...
81
/ 100
critical-risk
Severity 32/34 · Critical
Exploitability 27/34 · High
Exposure 22/34 · High