CVE intelligence and bounded remediation

CVE-2021-27942 — Vizio P65-F1 Firmware security vulnerability

High CVSS 7.2

Vizio P65-F1 6.0.31.4-2 and E50x-E1 10.0.31.4-2 Smart TVs allow a threat actor to execute arbitrary code from a USB drive via the Smart Cast functionality, because files on the USB drive are effectively under the web root and can be executed.

Severity
High
CVSS
7.2 (2.0)
Published
2021-08-03
CISA KEV
Not currently listed
Ecosystem
operating-system

Affected products

  • vizio / p65-f1_firmware / 6.0.31.4-2
  • vizio / e50x-e1_firmware / 10.0.31.4-2

Matched remediation archetype

Command, code, expression, and template injection

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Check exposure

  • Trace untrusted values to process execution, interpreters, evaluators, template engines, dynamic imports, and administrative scripting features.
  • Determine whether the affected path is reachable across each trust boundary and which service account or host privilege it inherits.
  • Review configuration for optional execution features, unsafe compatibility modes, and shell invocation.

Remediate safely

  • Replace string-built commands or evaluated code with fixed operations and structured argument APIs that do not invoke a shell.
  • Use strict allowlists for operation identifiers and reject unexpected input before it reaches any interpreter.
  • Update the affected component and add inert regression tests covering metacharacters, encoding variants, and alternate request paths.

Authoritative sources

Complete CVE record and remediation plan

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