ISO 27001 Supplier Security Questionnaire Template

ISO 27001 Supplier Security Questionnaire Template: Ensuring Organizational Security

Introduction

Most organizations depend on external suppliers, including cloud service providers, software vendors, consultants, payment processors, data-processing partners, and other service providers. These relationships support business operations, but they can also introduce information security risks. A weakness in a supplier’s controls may expose an organization to data breaches, service disruption, regulatory noncompliance, financial loss, and reputational damage. ISO/IEC 27001:2022 requires organizations to identify and manage information security risks within the scope of their information security management system (ISMS). This includes relevant risks arising from suppliers and the information and communication technology supply chain.

Why Supplier Security Matters under ISO 27001

The ISO/IEC 27001:2022 Annex A controls most directly associated with supplier security are controls 5.19 to 5.23. These address information security in supplier relationships, security requirements in supplier agreements, risks within the ICT supply chain, monitoring and management of changes to supplier services, and information security when using cloud services.

• Risk management: An organization should identify, analyze, evaluate, and treat information security risks associated with suppliers that access its information, systems, facilities, or critical services.
  
  

• Supply-chain exposure: A supplier’s vulnerability can become the organization’s risk when systems are integrated, data is exchanged, or essential services depend on that supplier.
  
  

• Legal and contractual obligations: Privacy, sector-specific, regulatory, and contractual requirements may apply to suppliers that process information or deliver services on the organization’s behalf.
  
  

• Operational resilience: Supplier failures, cyber incidents, or service interruptions may affect the organization’s ability to maintain critical operations and meet customer commitments.
  
  

• ISMS effectiveness: Supplier risks and controls should be included in the organization’s risk-management and assurance activities where they are relevant to the ISMS scope.

Supplier security should therefore be treated as an ongoing risk-management responsibility rather than a one-time procurement check.

What Is an ISO 27001 Supplier Security Questionnaire?

An ISO 27001 supplier security questionnaire is a structured set of questions used to evaluate a prospective or existing supplier’s information security practices. It helps an organization determine whether the supplier’s controls are appropriate for the service provided, the information involved, and the level of risk created by the relationship.

The questionnaire should reflect ISO/IEC 27001:2022 requirements, relevant Annex A controls, the organization’s internal policies, and applicable legal, regulatory, and contractual obligations. It should also be proportionate to the supplier’s risk level.

Main Benefits of the Questionnaire

• Risk identification: Reveals control gaps, vulnerabilities, dependencies, and other risks before they cause an incident.
  
  

• Due diligence: Creates a documented record showing that supplier security was considered during selection, onboarding, renewal, and review.
  
  

• Informed decision-making: Helps the organization approve, reject, conditionally approve, or further investigate a supplier.
  
  

• Contract development: Supports the inclusion of suitable security, privacy, incident-notification, audit, continuity, and termination requirements in supplier agreements.
  
  

• Ongoing assurance: Provides a baseline for monitoring changes in the supplier’s services, controls, risk profile, and performance.
  
  

• Audit evidence: Helps demonstrate that supplier-related information security risks are being managed through a defined and repeatable process.

Seven Components of an ISO 27001 Supplier Security Questionnaire

The following seven components organize the questionnaire into practical sections while aligning it with the current ISO/IEC 27001:2022 control structure.

1. Supplier Profile, Service Scope, and Data Access

Begin by establishing what the supplier provides, which information and systems it can access, and how important the service is to the organization. These details determine the depth of the assessment.

• Supplier details: Record the legal name, business address, primary contacts, service locations, ownership details, and relevant subcontractors.
  
  

• Service description: Describe the products or services provided and the business processes they support.
  
  

• Information access: Identify the types, classifications, and volumes of information the supplier will access, process, transmit, or store.
  
  

• System connectivity: Record integrations, privileged access, remote access, application programming interfaces, and network connections.
  
  

• Hosting and processing locations: Identify where information is stored or processed, including cloud regions and international transfers.
  
  

• Criticality: Determine the potential operational, financial, legal, and customer impact if the supplier’s service becomes unavailable or compromised.
  
  

• Subprocessor use: Identify fourth parties or subprocessors that may access the organization’s information or support delivery of the service.

2. Governance, Policies, People, and Compliance

This section determines whether the supplier has established suitable governance arrangements and whether employees and contractors understand their security responsibilities.

• Security governance: Does the supplier have defined information security roles, responsibilities, authority, and management oversight?

• Security policies: Are relevant information security policies documented, approved, communicated, and reviewed at planned intervals?

• Risk management: Does the supplier use a defined process to identify, assess, treat, monitor, and review information security risks?

• Competence and awareness: Are employees and contractors provided with security awareness and role-specific training?

• Personnel screening: Are appropriate screening checks completed before individuals receive access to sensitive information or critical systems, subject to applicable law?

• Confidentiality: Are employees, contractors, and relevant external parties bound by suitable confidentiality obligations?

• Independent assurance: Does the supplier hold relevant certifications or assurance reports, such as ISO/IEC 27001 certification or a current SOC report?

• Legal and regulatory compliance: How does the supplier identify and comply with applicable privacy, security, regulatory, statutory, and contractual requirements?

3. Asset, Access, Data Protection, and Cryptography Controls

This section evaluates how the supplier identifies and protects information and associated assets throughout their lifecycle.

• Asset inventory: Does the supplier maintain an accurate inventory of information and other associated assets used to deliver the service?

• Information classification: Is information classified and handled according to its sensitivity, value, and criticality?

• Access management: Are access rights formally requested, approved, provisioned, reviewed, modified, and revoked?

• Privileged access: Are administrative and other privileged accounts restricted, monitored, and reviewed?

• Authentication: Is multifactor authentication used where appropriate, particularly for privileged, remote, and cloud access?

• Data segregation: Is customer information logically or physically separated from information belonging to other customers?

• Encryption: Is sensitive information protected in transit and at rest using appropriate cryptographic controls?

• Key management: Are cryptographic keys generated, stored, rotated, revoked, backed up, and destroyed securely?

• Retention and deletion: Are information retention periods defined, and can the supplier securely return or delete information when required?

4. Technology, Operations, Development, and Cloud Security

This section examines the technical and operational controls used to protect the systems and services provided to the organization.

• Secure configuration: Are systems, devices, applications, and cloud services configured according to approved security standards?

• Vulnerability management: Are vulnerabilities identified, prioritized, remediated, and tracked within defined timeframes?

• Patch management: Are security patches evaluated, tested, deployed, and monitored through a controlled process?

• Malware protection: Are appropriate preventive, detective, and recovery controls used to protect against malware?

• Logging and monitoring: Are security-relevant events logged, protected, reviewed, and retained for an appropriate period?

• Network security: Are networks protected through suitable controls such as firewalls, secure protocols, segmentation, and intrusion detection or prevention?

• Backup: Are backups protected, tested, and maintained in accordance with defined recovery requirements?

• Secure development: Where software development is relevant, are security requirements, secure coding, testing, change control, and separation of environments incorporated into the development lifecycle?

• Cloud security: Where cloud services are used, are responsibilities, configurations, monitoring, data locations, portability, and exit arrangements clearly defined?

5. Incident Management, Business Continuity, and Resilience

This section evaluates whether the supplier can detect, manage, communicate, and recover from incidents that could affect the organization.

• Incident process: Does the supplier have a documented process for reporting, assessing, responding to, and learning from information security incidents?

• Customer notification: Does the supplier commit to notifying the organization within an agreed period when an incident affects its information or services?

• Escalation and communication: Are incident contacts, escalation paths, reporting content, and communication responsibilities defined?

• Evidence handling: Can the supplier collect, preserve, and protect evidence where investigation or legal action may be required?

• Business continuity: Does the supplier maintain business continuity and disaster recovery plans for services provided to the organization?

• Recovery objectives: Are recovery time objectives and recovery point objectives defined and aligned with business requirements?

• Testing: Are continuity and recovery arrangements exercised at planned intervals, and are identified weaknesses corrected?

• Service resilience: Are dependencies, single points of failure, capacity needs, and alternative arrangements understood and managed?

6. Supplier Agreements, Subcontractors, and Supply-Chain Security

ISO/IEC 27001:2022 emphasizes the need to establish and manage information security requirements throughout supplier relationships and the ICT supply chain.

• Security requirements: Are information security responsibilities and minimum controls documented in supplier agreements?

• Right to assess: Does the agreement allow the organization to request evidence, conduct assessments, or obtain independent assurance where justified?

• Incident obligations: Are security incident notification, cooperation, investigation, remediation, and reporting obligations defined?

• Subcontractor controls: Must the supplier perform due diligence on its own suppliers and impose equivalent security requirements where appropriate?

• Change management: Must the supplier notify the organization about material changes to services, locations, technologies, ownership, or subcontractors?

• Service-level requirements: Are security-related service levels, availability targets, recovery objectives, and performance measures established?

• Exit and termination: Are information return, secure deletion, access revocation, transition assistance, and continuing confidentiality requirements defined?

• Accountability: Does the agreement make responsibilities clear without assuming that outsourcing transfers the organization’s accountability for managing its own risks?

7. Evidence, Scoring, Approval, and Ongoing Monitoring

Questionnaire responses should be evaluated consistently and supported by suitable evidence. Self-declared answers alone may not provide sufficient assurance for high-risk suppliers.

• Evidence requests: Request relevant policies, certificates, audit reports, penetration-test summaries, continuity-test results, diagrams, and other records proportionate to the risk.
  
  

• Response options: Use consistent choices such as Yes, Partially Implemented, No, Not Applicable, and Further Information Required.
  
  

• Weighted scoring: Assign greater weight to questions related to critical services, sensitive information, privileged access, incident response, resilience, and legal obligations.
  
  

• Risk rating: Use defined criteria to classify the supplier as low, medium, high, or critical risk.
  
  

• Gap management: Record weaknesses, required actions, responsible owners, target dates, compensating controls, and residual risk.
  
  

• Approval decision: Document whether the supplier is approved, conditionally approved, rejected, or escalated for further review.
  
  

• Risk acceptance: Ensure that any accepted supplier risk is informed, documented, authorized by the appropriate risk owner, and monitored. Risk acceptance does not mean ignoring the risk.
  
  

• Reassessment: Review suppliers at planned intervals and after significant changes, incidents, service failures, or changes in risk exposure.

Designing the Questionnaire Template

The template should be proportionate, easy to complete, and capable of producing reliable information for decision-making.

• Apply a risk-based approach: A low-risk office supplier should not receive the same assessment as a cloud provider that stores confidential customer information.
  
  

• Use multiple question types: Combine yes-or-no questions, multiple-choice responses, open-ended explanations, and evidence requests.
  
  

• Include guidance: Explain unfamiliar terms, required evidence, scoring rules, and the conditions under which a question may be marked not applicable.
  
  

• Define mandatory questions: Identify responses that may prevent approval or require escalation, regardless of the overall score.
  
  

• Allow supporting comments: Give suppliers space to describe alternative controls, remediation plans, exceptions, and relevant context.
  
  

• Protect questionnaire information: Treat supplier responses and supporting documents according to their sensitivity and any confidentiality obligations.

Implementing the Supplier Questionnaire Process

The questionnaire should be integrated into procurement, supplier onboarding, contract management, risk management, and periodic review activities.

1. Classify the supplier: Determine the service criticality, information exposure, system access, dependency level, and potential business impact.
   
   

2. Issue the appropriate questionnaire: Select a short, standard, or enhanced version based on the supplier’s risk tier.
   
   

3. Review the responses: Check completeness, consistency, relevance, and supporting evidence rather than relying only on the supplier’s statements.
   
   

4. Identify and evaluate gaps: Assess the likelihood and consequences of weaknesses and determine the resulting risk level.
   
   

5. Agree on treatment actions: Require remediation, contractual protections, additional controls, monitoring, risk avoidance, or formally authorized risk acceptance.
   
   

6. Approve and document the decision: Record the reviewer, approver, conditions, residual risks, deadlines, and rationale for the decision.
   
   

7. Monitor and reassess: Track corrective actions, performance, incidents, assurance reports, material changes, and scheduled reassessments.

Recommended Questionnaire Record Fields

• Supplier identification: Supplier name, service, business owner, relationship owner, and security contact.
  
  

• Risk classification: Supplier tier, data classification, service criticality, access level, and inherent risk rating.
  
  

• Question details: Question ID, security topic, requirement, response, supplier comments, and applicability.
  
  

• Evidence details: Evidence requested, evidence received, review date, reviewer, validity period, and observations.
  
  

• Assessment result: Question score, control effectiveness, identified gap, and risk rating.
  
  

• Treatment details: Required action, action owner, target date, status, compensating control, and residual risk.
  
  

• Approval details: Decision, conditions, risk owner, approver, approval date, and next review date.

Benefits of an ISO 27001-Aligned Supplier Questionnaire

• Stronger security: Identifies supplier weaknesses before they affect the organization’s information or operations.
  
  

• Consistent due diligence: Establishes a repeatable assessment method across procurement and supplier-management teams.
  
  

• Improved compliance: Supports evidence that supplier-related risks and obligations are being addressed systematically.
  
  

• Clearer expectations: Helps translate security requirements into contractual commitments and measurable responsibilities.
  
  

• Better supplier relationships: Encourages transparent discussions about security capabilities, limitations, and improvement actions.
  
  

• Reduced losses: Early identification and treatment of risk can reduce the likelihood and impact of incidents, disruption, penalties, and reputational damage.

Important Limitations

A completed questionnaire should not automatically be treated as proof that every stated control operates effectively. The required level of verification should depend on the supplier’s risk. For higher-risk suppliers, assurance may include reviewing independent audit reports, validating certifications, conducting interviews, examining evidence samples, assessing test results, performing technical testing where authorized, or exercising contractual audit rights. Any verification activity should be lawful, proportionate, agreed, and appropriately documented.

Conclusion

An ISO 27001 supplier security questionnaire is a practical tool for identifying and managing information security risks associated with external providers. When it is risk-based, evidence-supported, and integrated into the supplier lifecycle, it can improve due diligence, strengthen contractual controls, support informed approval decisions, and provide useful ISMS records. The questionnaire should reflect the organization’s context and the current ISO/IEC 27001:2022 control structure. It should also be supported by ongoing monitoring, periodic reassessment, and appropriate verification. Used in this way, the questionnaire becomes more than a checklist—it becomes an important part of a mature and resilient supplier security program.