CVE-2020-29583 Zyxel Multiple Products Use of Hard-Coded Credentials

What is CVE-2020-29583?

CVE-2020-29583 is a critical vulnerability in n/a, published on 22 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-522

Which versions are affected by CVE-2020-29583?

It affects 30 products.

Products include Zyxel Atp100 Firmware, Zyxel Atp100w Firmware, Zyxel Atp200 Firmware, Zyxel Atp500 Firmware, Zyxel Atp700 Firmware, Zyxel Atp800 Firmware and 24 more.

How do I fix CVE-2020-29583?

No fix has been published for CVE-2020-29583 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 3 May 2022.

Is CVE-2020-29583 being exploited?

Yes. Attackers have exploited CVE-2020-29583 in the wild since at least 3 Nov 2021.

Public exploit code: 1 Nuclei template and 1 proofs of concept on GitHub.

Other vulnerabilities in n/a

• CVE-2023-33009 Zyxel Multiple Firewalls Buffer Overflow Exploited Critical 9.8
• CVE-2023-33010 Zyxel Multiple Firewalls Buffer Overflow Exploited Critical 9.8
• CVE-2023-28771 Zyxel Multiple Firewalls OS Command Injection Exploited Critical 9.8
• CVE-2022-30525 Zyxel Multiple Firewalls OS Command Injection Exploited Critical 9.8
• CVE-2020-9054 Zyxel Multiple NAS Devices OS Command Injection Exploited Critical 9.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-59jx-m3c4-2m9w.