Known exploited vulnerability
CVE-2020-29583
The short answer
CVE-2020-29583 affects n/a n/a and is rated critical (CVSS 9.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2021-11-03: attackers are using it, so patch it first.
What it is
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.
Severity
9.8 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Nov 3, 2021
Federal due date May 3, 2022
EPSS, next 30 days
90%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply updates per vendor instructions.
Affected products
n/a. NVD's record lists the exact affected versions.
References
- businessforum.zyxel.com/discussion/5252/zld-v4-60-revoke-and-wk48-firmware-release Release Notes
- businessforum.zyxel.com/discussion/5254/whats-new-for-zld4-60-patch-1-available-on-dec-15 Release Notes
- www.eyecontrol.nl/blog/undocumented-user-account-in-zyxel-products.html Broken LinkThird Party Advisory
- www.secpod.com/blog/a-secret-zyxel-firewall-and-ap-controllers-could-allow-for-administrative-access-cve-2020-29583/ ExploitThird Party Advisory
- www.zyxel.com/support/CVE-2020-29583.shtml Vendor Advisory
- www.zyxel.com/support/security_advisories.shtml Vendor Advisory
- businessforum.zyxel.com/discussion/5252/zld-v4-60-revoke-and-wk48-firmware-release Release Notes
- businessforum.zyxel.com/discussion/5254/whats-new-for-zld4-60-patch-1-available-on-dec-15 Release Notes
- www.eyecontrol.nl/blog/undocumented-user-account-in-zyxel-products.html Broken LinkThird Party Advisory
- www.secpod.com/blog/a-secret-zyxel-firewall-and-ap-controllers-could-allow-for-administrative-access-cve-2020-29583/ ExploitThird Party Advisory
- www.zyxel.com/support/CVE-2020-29583.shtml Vendor Advisory
- www.zyxel.com/support/security_advisories.shtml Vendor Advisory
Questions
Is CVE-2020-29583 being exploited?
Yes. CISA added CVE-2020-29583 to its Known Exploited Vulnerabilities catalog on 2021-11-03, with a federal remediation due date of 2022-05-03.
How do I fix CVE-2020-29583?
CISA's required action: Apply updates per vendor instructions.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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