CVE intelligence and bounded remediation

CVE-2019-3932 — Crestron Am-100 Firmware security vulnerability

Critical CVSS 9.8

Crestron AM-100 with firmware 1.6.0.2 and AM-101 with firmware 2.7.0.2 are vulnerable to authentication bypass due to a hard-coded password in return.tgi. A remote, unauthenticated attacker can use this vulnerability to control external devices via the uart_bridge.

Severity
Critical
CVSS
9.8 (3.1)
Published
2019-04-30
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-249, CWE-798

Affected products

  • crestron / am-100_firmware / 1.6.0.2
  • crestron / am-101_firmware / 2.7.0.2

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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