Home/CVE/Zyxel Multiple Products Use of Hard-Coded Credentials Vulnerability
CVE

CVE-2020-29583

Zyxel Multiple Products Use of Hard-Coded Credentials Vulnerability

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.

CRITICAL · CVSS 9.8 ⚠ CISA KEV EPSS 0.94302
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 0% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

⬡

Weakness Classification

CWE-522Insufficiently Protected Credentials
CWE-522Insufficiently Protected Credentials
▤

Affected Products & Versions

30
zyxel usg20-vpn firmwareall versions
zyxel usg20w-vpn firmwareall versions
zyxel usg40 firmwareall versions
zyxel usg40w firmwareall versions
zyxel usg60 firmwareall versions
zyxel usg60w firmwareall versions
zyxel usg110 firmwareall versions
zyxel usg210 firmwareall versions
⚠

Public Exploits & PoCs

2
nucleiZyXel USG - Hardcoded Credentialscritical
pocwww.secpod.com · a-secret-zyxel-firewall-and-ap-controllers-could-allow-fo...www.secpod.com
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD22 Dec 2020 · 10:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
cisaKEV-CVE-2020-29583
🔗

References & Sources

7
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://ftp.zyxel.com/USG40/firmware/USG40_4.60%28AALA.1%29C0_2.pdfBroken Link
https://businessforum.zyxel.com/discussion/5252/zld-v4-60-revoke-and-wk48-firmware-releaseRelease Notes
https://businessforum.zyxel.com/discussion/5254/whats-new-for-zld4-60-patch-1-available-on-dec-15Release Notes
https://www.eyecontrol.nl/blog/undocumented-user-account-in-zyxel-products.htmlBroken LinkThird Party Advisory
https://www.zyxel.com/support/CVE-2020-29583.shtmlVendor Advisory
https://www.zyxel.com/support/security_advisories.shtmlVendor Advisory
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