CVE-2020-29583: Zyxel Multiple Products Use of Hard-Coded Credentials Vulnerability
CVE-2020-29583 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2021-11-03
Zyxel firewalls and AP controllers contain an undocumented administrative account (zyfwp) with a hard-coded, unchangeable password stored in cleartext within the firmware. Remote attackers can exploit this to gain full administrative access to the device via the SSH server or web interface.
Quick answers
Is CVE-2020-29583 exploited in the wild?
Yes. CVE-2020-29583 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.
How severe is CVE-2020-29583?
Critical severity, with a CVSS score of 9.8, published 3 November 2021.
Which products and versions are affected?
Zyxel ATP Series Firewall 4.60; Zyxel USG Series Firewall 4.60; Zyxel USG FLEX Series Firewall 4.60; Zyxel VPN Series Firewall 4.60; and 2 more.
Is there a fix for CVE-2020-29583?
A patch was published on 2020-12-15: ZLD V4.60 Patch 1 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2020-29583 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2020-29583?
Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Affected products
Zyxel ATP Series Firewall 4.60
Zyxel USG Series Firewall 4.60
Zyxel USG FLEX Series Firewall 4.60
Zyxel VPN Series Firewall 4.60
Zyxel NXC2500 AP Controller 6.00 through 6.10
Zyxel NXC5500 AP Controller 6.00 through 6.10
Timeline
2020-12-15: patched: ZLD V4.60 Patch 1 released
2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog