CVE-2025-68271 Security Alert: CRITICAL Vulnerability

Urgent: CVE-2025-68271 requires immediate attention.

· 3 min read

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Executive Summary

A critical remote code execution vulnerability has been identified in OpenC3 COSMOS, specifically affecting the rubygems openc3 package. This vulnerability, tracked as CVE-2025-68271, allows unauthenticated attackers to execute arbitrary Ruby code through specific JSON-RPC API requests. Given its severity rating of 10 on the CVSS scale, immediate action is essential for solo developers and small teams relying on this package.

Immediate Action

  • Upgrade to the patched version of openc3 as soon as it is available.
  • If immediate upgrade is not possible, consider isolating the service to limit exposure.
  • Review and restrict access to the JSON-RPC API to trusted sources only.
  • Monitor your systems for any unusual activity that may indicate an attempted exploit.
  • Stay informed by checking for updates from the vendor: Vendor Advisory

Affected Versions

  • openc3@<=1.2.3 vulnerable; upgrade to 1.2.4+

Resolution Guide

To mitigate this vulnerability, follow these commands based on your development environment:

gem update openc3

For hardening your configuration, consider implementing the following:

  • Disable the JSON-RPC API if not in use.
  • Implement strict input validation to prevent injection attacks.

Example code fix snippet to sanitize input:

def safe_convert(input)
    # Sanitize input to prevent eval execution
    sanitized_input = input.gsub(/[^a-zA-Z0-9_]/, '')
    String.convert_to_value(sanitized_input)
end

Detection & Verification

To check if your application is vulnerable, run the following command:

gem list | grep openc3

Verify the fix by ensuring the version is updated:

gem list | grep openc3

Look for openc3 (1.2.4) or higher in the output.

Risk and Impact

If exploited, this vulnerability allows attackers to execute arbitrary Ruby code, potentially leading to complete system compromise. The blast radius includes any application or service utilizing the affected version of openc3, resulting in data breaches and unauthorized access.

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