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Loss of Availability

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Loss of Availability
ID T0826
Tactic Impact


Adversaries may attempt to disrupt essential components or systems to prevent owner and operator from delivering products or services.123

Adversaries may leverage malware to delete or encrypt critical data on HMIs, workstations, or databases.

In the 2021 Colonial Pipeline ransomware incident, pipeline operations were temporally halted on May 7th and were not fully restarted until May 12th.4

Procedure Examples

  • A Conficker infection at a nuclear power plant forced the facility to temporarily shutdown.5


  • Out-of-Band Communications Channel - Provide operators with redundant, out-of-band communication to support monitoring and control of the operational processes, especially when recovering from a network outage 6. Out-of-band communication should utilize diverse systems and technologies to minimize common failure modes and vulnerabilities within the communications infrastructure. For example, wireless networks (e.g., 3G, 4G) can be used to provide diverse and redundant delivery of data.
  • Redundancy of Service - Hot-standbys in diverse locations can ensure continued operations if the primarily system is compromised or unavailable. At the network layer, protocols such as the Parallel Redundancy Protocol can be used to simultaneously use redundant and diverse communication over a local network.7
  • Data Backup - Take and store data backups from end user systems and critical servers. Ensure backup and storage systems are hardened and kept separate from the corporate network to prevent compromise. Maintain and exercise incident response plans 8, including the management of "gold-copy" back-up images and configurations for key systems to enable quick recovery and response from adversarial activities that impact control, view, or availability.