CVE intelligence and bounded remediation

CVE-2020-16839 — Crestron Dm-Nvx-Dir-80 Firmware security vulnerability

High CVSS 7.5

On Crestron DM-NVX-DIR, DM-NVX-DIR80, and DM-NVX-ENT devices before the DM-XIO/1-0-3-802 patch, the password can be changed by sending an unauthenticated WebSocket request.

Severity
High
CVSS
7.5 (3.1)
Published
2021-07-30
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-287

Affected products

  • crestron / dm-nvx-dir-80_firmware / 1.0.1.788
  • crestron / dm-nvx-dir-160_firmware / 1.0.1.788
  • crestron / dm-nvx-dir-ent_firmware / 1.0.1.788

Matched remediation archetype

Authentication bypass and missing authentication

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Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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