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ISC2 Systems Security Certified Practitioner (SSCP) Practice Question

A utility company operates 5,000 IoT-enabled smart meters across multiple remote sites. To remediate newly discovered vulnerabilities, the security team wants to push quarterly over-the-air (OTA) firmware updates. Which control will BEST ensure that only legitimate vendor code is installed and prevent malicious or corrupted images from disabling the meters during the update process?

  • Transfer firmware images to meters using SNMPv3 to encrypt the update traffic in transit.

  • Enforce cryptographic code-signing and on-device signature verification for every OTA firmware package.

  • Enable automatic rollback to factory defaults immediately after each firmware update completes.

  • Schedule OTA deployments only during off-peak energy-usage windows to limit customer impact.

ISC2 Systems Security Certified Practitioner (SSCP)
Network and Communication Security
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