Cybersecurity and safety have increasing interdependence in today's inter-connected and digital world. Regulatory bodies such as the International Maritime Organisation now require that safety management system consider cyber risk management and that cyber risks are appropriately addressed. This introduces challenges due to differing risk paradigms: cybersecurity focuses on environmental risks to systems and missions, while safety considers system risks to the environment. Traditional safety risk assessments rely on quantitative event likelihoods, a concept not easily applicable to cybersecurity risks. To address this challenge, we have developed a process which allows for the assessment of the impact of a cybersecurity risk on a safety risk without the need to quantitatively define its likelihood. The process evaluates the degree of effectiveness of the control against cybersecurity risks and uses this evaluation to assess the impact on the tolerability of safety risks. This approach provides a structured process to ensure that cybersecurity measures do not inadvertently compromise safety, thereby maintaining the overall integrity of safety-critical systems.