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CVE-2020-29583

9.8 · CRITICALActively Exploited

Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with an unchangeable password.

Published Dec 22, 2020CWE-522EPSS 90.16%

Overview

CVE-2020-29583 is a critical-severity vulnerability. It was published on December 22, 2020 and has a CVSS 3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refftp.zyxel.com/USG40/firmware/USG40_4.60%28AALA.1%29C0_2.pdfRefbusinessforum.zyxel.com/discussion/5252/zld-v4-60-revoke-and-wk48-firmware-releaseRefbusinessforum.zyxel.com/discussion/5254/whats-new-for-zld4-60-patch-1-available-on-dec-15Refwww.eyecontrol.nl/blog/undocumented-user-account-in-zyxel-products.htmlRefwww.secpod.com/blog/a-secret-zyxel-firewall-and-ap-controllers-could-allow-for-administrative-access-cve-2020-29583/Refwww.zyxel.com/support/CVE-2020-29583.shtmlRefwww.zyxel.com/support/security_advisories.shtmlRefftp.zyxel.com/USG40/firmware/USG40_4.60%28AALA.1%29C0_2.pdfRefbusinessforum.zyxel.com/discussion/5252/zld-v4-60-revoke-and-wk48-firmware-releaseRefbusinessforum.zyxel.com/discussion/5254/whats-new-for-zld4-60-patch-1-available-on-dec-15

How CyberStrike helps

Frequently asked questions

What is CVE-2020-29583?

CVE-2020-29583 is a critical-severity vulnerability. It was published on December 22, 2020 and has a CVSS 3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2020-29583?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2020-29583?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-29583?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-29583 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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