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CVE-2020-29583: Zyxel Multiple Products Use of Hard-Coded Credentials Vulnerability

criticalknown exploitedpublic exploitCVE-2020-29583
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: Zyxelproduct: Zyxel firewalls and AP ControllersAuthentication bypass
What
Zyxel firewalls and AP Controllers contain a use of hard-coded credentials vulnerability.
Who is affected
Deployments of Zyxel firewalls (ATP, USG, VM) and AP Controllers (NXC2500 and NXC5500).
Urgency
Remediation is urgent due to the critical nature of the vulnerability and its exploitation status.
Action
Update to a version that removes the hard-coded credentials.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2020-29583

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2020-29583coverage & exploitation statusNVD · CVE.org

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