Vulnerability in Zyxel Atp100
CVE-2020-29583
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.902 (99.8th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.902 · newest: 0.902 · change: 0.000
Affected products
- Zyxel Atp100
- Zyxel Atp100 Firmware — versions 4.60
- Zyxel Atp100w
- Zyxel Atp100w Firmware — versions 4.60
- Zyxel Atp200
- Zyxel Atp200 Firmware — versions 4.60
- Zyxel Atp500
- Zyxel Atp500 Firmware — versions 4.60
- Zyxel Atp700
- Zyxel Atp700 Firmware — versions 4.60
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Public proof-of-concept exploits
References
- www.zyxel.com/support/security_advisories.shtml (Vendor Advisory)
- ftp.zyxel.com/USG40/firmware/USG40_4.60(AALA.1)C0_2.pdf (Broken Link)
- businessforum.zyxel.com/discussion/5254/whats-new-for-zld4-60-patch-1-available… (Release Notes)
- businessforum.zyxel.com/discussion/5252/zld-v4-60-revoke-and-wk48-firmware-rele… (Release Notes)
- www.eyecontrol.nl/blog/undocumented-user-account-in-zyxel-products.html (Third Party Advisory, Broken Link)
- www.zyxel.com/support/CVE-2020-29583.shtml (Vendor Advisory)
- www.secpod.com/blog/a-secret-zyxel-firewall-and-ap-controllers-could-allow-for-… (Exploit, Third Party Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2020-29583?
- CVE-2020-29583 is a critical-severity vulnerability in Zyxel Atp100, classified under Insufficiently Protected Credentials. CVSS score: 9.8/10. Published 2020-12-22.
- How severe is CVE-2020-29583?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2020-29583 known to be exploited?
- Yes. CVE-2020-29583 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 24 public proof-of-concept repositories are indexed.