ISO/IEC 27005 is a standard for information security risk management. It describes a repeatable cycle: identify risks, analyze their likelihood and impact, evaluate which risks matter most, treat them with suitable controls, and review the outcome. The goal is not to create a one-time document, but to keep risk decisions tied to how systems actually operate.
In cyber security, this matters because threats, assets, and workflows change constantly. A new cloud integration, a vendor connection, or a revised access model can introduce fresh exposure even when the technology looks unchanged. ISO/IEC 27005 helps defenders prioritize controls such as logging, segmentation, backup, access control, and monitoring based on current risk. Attackers benefit when organizations skip this process, leaving stale assumptions, weak oversight, and unreviewed controls in place. Used well, the standard supports continuous improvement and makes security a living operational discipline.