ISO/IEC 27034.

What ISO/IEC 27034 sets out to do

ISO/IEC 27034 is the application security member of the ISO/IEC 27000 family. Where ISO/IEC 27001 governs the management system that runs your whole information security programme, ISO/IEC 27034 narrows the lens to one thing: building and operating secure applications across the full software lifecycle, from requirements and design through build, test, deployment, and maintenance. It is a multi-part standard, which means the guidance is spread over several documents rather than packed into a single certifiable specification, and that shape tells you something about its intent. It is meant to inform how development is done, not to hand an auditor a tick-box checklist.

The reason it stays in the background while ISO/IEC 27001 gets the attention is structural. Most of an organisation talks about policies, risk registers, and certificates; 27034 talks to the people writing and shipping code. It lives inside the software development lifecycle (SDLC), so its audience is developers, architects, and application security engineers rather than the compliance team. That makes it the ISO standard most fluent in the language of dev teams, and the one most likely to map cleanly onto how an engineering organisation actually works day to day.

The application security control idea

The organising concept in ISO/IEC 27034 is treating application security as a set of verifiable controls woven into the lifecycle, rather than a security review bolted on at the end. The standard frames security requirements as something you derive from the application context, the data it handles, and the threats it faces, then carry forward through design, implementation, and verification so that each control has a defined point where it is built in and a defined point where it is checked. The practical effect is that security stops being a gate at release and becomes a property maintained at every stage, which is exactly the shift modern secure development practice has been pushing for years.

Because the standard is process-oriented and lifecycle-shaped, it sits comfortably alongside the prescriptive, hands-on material teams already use. It does not replace the OWASP Application Security Verification Standard or the OWASP Top 10; it gives those a governance frame to hang from. It also pairs naturally with software bill of materials (SBOM) practice, where knowing exactly what components ship in an application is the maintenance-phase control that keeps the lifecycle honest after release. Used together, 27034 supplies the structure and OWASP and SBOM supply the concrete techniques and inventories.

Where it fits next to ISO/IEC 27001

The cleanest way to position ISO/IEC 27034 is as the application-layer detail beneath an ISO/IEC 27001 management system. ISO/IEC 27001 certifies that you run an information security management system with risk assessment and continual improvement, and its control set includes secure development expectations stated at a high level. ISO/IEC 27034 is where you go to actually implement those expectations in engineering: how secure requirements are captured, how controls are verified, how security travels through the SDLC. A team certified to 27001 can use 27034 to give substance to its secure development controls, and a development organisation can use 27034 to make sure the code it ships would stand up to that wider management system.

In practice, organisations rarely certify against 27034 the way they certify against 27001. They adopt it as guidance, lift the lifecycle structure into their own secure development standard, and reference it when they need an authoritative basis for why application security is handled the way it is. For a small team, the value is the same as it is for an enterprise: a recognised, vendor-neutral way to describe a secure SDLC that auditors, customers, and developers all accept.