Adversaries may cause a denial of control to temporarily prevent operators and engineers from interacting with process controls. An adversary may attempt to deny process control access to cause a temporary loss of communication with the control device or to prevent operator adjustment of process controls. An affected process may still be operating during the period of control loss, but not necessarily in a desired state.^[1],[2],[3]

In the 2017 Dallas Siren incident operators were unable to disable the false alarms from the Office of Emergency Management headquarters.^[4]

References

1. Corero Industrial Control System (ICS) Security Retrieved. 2019/11/04
2. Michael J. Assante and Robert M. Lee SANS Industrial Control System (ICS) Security; The Industrial Control System Cyber Kill Chain Retrieved 2024/11/25
3. Tyson Macaulay Michael J. Assante and Robert M. Lee Corero Industrial Control System (ICS) Security Retrieved. 2019/11/04 The Industrial Control System Cyber Kill Chain Retrieved. 2019/11/04 RIoT Control: Understanding and Managing Risks and the Internet of Things Retrieved. 2019/11/04
4. Mark Loveless 2017, April 11 THE DALLAS COUNTY SIREN HACK Retrieved. 2020/11/06

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