November 3, 2021 · Applied Cybernetics Group
CVE-2020-29583 — Zyxel Multiple Products
Zyxel Multiple Products Use of Hard-Coded Credentials Vulnerability
- Added to KEV
2021-11-03- Federal due date
2022-05-03- Vendor
- Zyxel
- Product
- Multiple Products
- EPSS
- 99.9th percentile (score 0.943, as of
2026-06-08) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2020-29583
CISA short description
Zyxel firewalls (ATP, USG, VM) and AP Controllers (NXC2500 and NXC5500) contain a use of hard-coded credentials vulnerability in an undocumented account ("zyfwp") with an unchangeable password.
Required action
Apply updates per vendor instructions.