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This book constitutes the refereed proceedings of the 9th International Symposium on Engineering Secure Software and Systems, ESSoS 2017, held in Bonn, Germany in July 2017. The 12 full papers presented together with 3 short papers were carefully reviewed and selected from 32 submissions.
The goal of this symposium is to bring together researchers and practitioners to advance the states of the art and practice in secure software engineering.

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Cloud security, virtualization for security.- Mobile devices security.- Automated techniques for vulnerability discovery and analysis.- Model checking for security.- Verification techniques for security properties.- Security by design.- Web applications security.- Empirical secure software engineering.- Embedded software security.

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