CVE intelligence and bounded remediation

CVE-2021-3583 — A flaw was found in Ansible, where a user's controller is vulnerable to template injection

High CVSS 7.1

A flaw was found in Ansible, where a user's controller is vulnerable to template injection. This issue can occur through facts used in the template if the user is trying to put templates in multi-line YAML strings and the facts being handled do not routinely include special template characters. This flaw allows attackers to perform command injection, which discloses sensitive information. The highest threat from this vulnerability is to confidentiality and integrity.

Severity
High
CVSS
7.1 (3.1)
Published
2021-09-22
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-20, CWE-94

Affected products

  • redhat / ansible_automation_platform / 1.2
  • redhat / ansible_engine
  • redhat / ansible_tower

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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