Sustainable digitalization is a growing trend in which digital technology is used to promote environmental, social, and economic sustainability. Cyber threats can undermine sustainability efforts, resulting in economic and social disruptions. Therefore, it is important to consider cyber security as an integral component of sustainable digitalization. This paper explores the opportunities and challenges that arise from the integration of cyber security and sustainable digitalization. The paper argues that cyber security is critical to the advancement of sustainable digitalization and that both fields must be integrated to achieve their objectives. The paper examines the various risks associated with cyber security, such as privacy violations and data breaches, and highlights the need for flexible cyber security policies and regulations that can adapt to the rapidly changing digital landscape. Moreover, the paper recommends a multi-stakeholder approach to cyber security that takes into account the interests of all parties involved, including governments, businesses, and individuals. The paper provides a valuable resource for policymakers, researchers, and practitioners in the field of cyber security and sustainable development, helping them to navigate the complex challenges and opportunities of integrating cyber security into sustainable digitalization.