Managing Information Security in the ICT Supply Chain

It is an organizational control requiring specific processes to identify and manage information security risks associated with the supply chain of ICT products (hardware, software) and services (cloud platforms).

Implementation involves establishing secure procurement standards, defining security requirements for ICT products, validating supplier security practices (e.g., secure development lifecycle), and monitoring for component vulnerabilities.

Auditors look for a Third-Party Management Policy addressing ICT risks, records of vendor security reviews, evidence of dependency scanning (SCA) for software, and contracts with supply chain security clauses. WatchDog Security's Compliance Center can help organize evidence collection and highlight gaps (for example, missing review records or incomplete supplier registries) so audit sampling is faster and more consistent.

Assessments involve reviewing third-party audit reports (SOC 2, ISO 27001), evaluating their shared responsibility models, and verifying their incident response and business continuity capabilities.

Procurement requirements should include mandatory security review gates, minimum security standards (e.g., encryption, SSO), and requirements for vendors to demonstrate their own supply chain security.

While not explicitly mandated by the text, maintaining a Software Bill of Materials (SBOM) or requiring secure development attestations is increasingly considered best practice evidence for managing software supply chain risks.

Monitor through continuous vulnerability scanning of their products, subscribing to their security bulletins, using threat intelligence feeds, and conducting periodic re-assessments. WatchDog Security's Vulnerability Management can help consolidate vulnerability signals, drive a consistent triage workflow, and track MTTR metrics that support ongoing supplier monitoring.

The organization must ensure that direct suppliers manage their own upstream risks; contracts should include 'flow-down' clauses requiring suppliers to enforce security obligations on their subcontractors.

A robust Third-Party Management Policy that specifically addresses ICT risks, a Secure Procurement Policy, and procedures for vendor onboarding and offboarding are essential.

A.5.19/20 cover the general management and contractual aspects of all supplier relationships, whereas A.5.21 specifically focuses on the technical integrity, component risks, and provenance of ICT products and services.

ICT supply chain risk often shows up as newly disclosed vulnerabilities in third-party software and services you rely on, and teams struggle when findings are scattered across scanners and ticket queues. WatchDog Security's Vulnerability Management helps by ingesting findings from multiple sources, supporting triage workflows, and tracking remediation timelines so you can demonstrate ongoing monitoring and response for supplier-related vulnerabilities.

Organizations cannot manage ICT supply chain risk if they do not have a reliable view of which cloud services, SaaS tools, and connected identities are actually in use. WatchDog Security's Asset Inventory helps by discovering assets across environments and mapping SaaS usage and identities, which improves the completeness of your ICT supplier registry and reduces the chance of “shadow IT” introducing unmanaged supply chain exposure.