Supply Chain Cybersecurity
Vendor Security Assessments Explained: What to Evaluate
A vendor security assessment evaluates a third party's security posture before and during engagement. It typically includes security questionnaires, certification reviews (SOC 2, ISO 27001), penetration test reports, and architecture reviews. The goal is to understand real risk, not just collect compliance documents.
Andreas Johansson · Chief Executive Officer
Senior IT management leader with 25 years of experience in Cloud, Security, and Datacenter infrastructure.
Why Assessments Matter
Vendor assessments help you understand whether a third party will protect your data and access at an acceptable level — before an incident proves otherwise.
Assessment Components
Security Questionnaires
Standardized questionnaires (SIG, CAIQ, or custom) cover:
- Access controls and authentication
- Data encryption and handling
- Incident response capabilities
- Employee security training
- Business continuity and disaster recovery
Certification Review
- SOC 2 Type II — independent audit of security controls over time
- ISO 27001 — information security management system certification
- PCI DSS — if handling payment data
Technical Evidence
- Recent penetration test reports
- Vulnerability management program details
- Architecture and data flow documentation
What to Look For Beyond Checkboxes
- How quickly do they notify you of incidents?
- What access do they actually need?
- How do they manage their own third parties?
- What happens to your data at contract end?
- Do they have a real security team?
Assessment Frequency
- Critical vendors: annually + continuous monitoring
- Important vendors: annually
- Standard vendors: at onboarding + periodic review
How SeqOps fits
SeqOps finds known vulnerabilities in the software installed on your servers, including third-party components, and shows which to patch first. It doesn't assess your vendors.