Deep Layer Security Advisory
Information Security & GRCProgram Development3 – 5 Weeks

Third-Party Risk Management

A Structured Program for Vendor Security from Onboarding Through Offboarding

Most organizations have no visibility into which vendors have access to their data, systems, or environments. Procurement selects vendors based on functionality and cost. Security is consulted after contracts are signed — if at all. When a vendor is breached, the organization cannot determine its exposure because there is no vendor inventory, no tiering, and no contractual security requirements.

This engagement builds a third-party risk management program covering the full vendor lifecycle. We inventory and tier vendors by risk, develop assessment questionnaires calibrated to vendor tier, define contractual security requirements, and build workflows for onboarding, ongoing monitoring, and offboarding.

The result is a program that scales — not one that requires a security review for every SaaS tool purchase, but one that directs assessment effort proportional to vendor risk.

NIST SP 800-161 (Supply Chain Risk Management)ISO 27001 Annex A.15 (Supplier Relationships)SOC 2 Common Criteria (CC9.2)SIG (Standardized Information Gathering) Questionnaire

Who This Is For

Ideal clients for this engagement.

Organizations with no formal vendor risk management program
Companies that assess vendors ad hoc but have no consistent process or lifecycle management
Organizations where procurement and security operate independently with no integration

The Problem

What this engagement addresses.

No Vendor Visibility

The organization cannot produce a list of vendors with access to sensitive data, production systems, or critical business processes. Shadow IT and departmental SaaS purchases create unknown exposure.

Assessment Without Process

Security questionnaires are sent to some vendors sometimes, but there is no consistent methodology, no tiering to direct effort, and no follow-up on findings. Assessment is a one-time activity rather than a lifecycle.

Procurement-Security Gap

Vendors are selected and contracts are signed before security is involved. Contractual security requirements are absent or generic. By the time security reviews the vendor, the business relationship is already committed.

Vendor Offboarding Gaps

When vendor relationships end, there is no process for revoking access, retrieving data, verifying deletion, or updating the vendor inventory. Former vendors retain access months or years after the relationship ends.

Deliverables

What you receive.

01

Vendor Inventory & Tiering Model

Complete vendor inventory with risk-based tiering (critical, high, medium, low) based on data access, system access, business criticality, and regulatory exposure. Tiering drives assessment depth and monitoring frequency.

02

Assessment Questionnaires

Tiered assessment questionnaires calibrated to vendor risk level. Critical vendors receive comprehensive questionnaires; low-risk vendors receive streamlined assessments. Includes scoring methodology and risk rating criteria.

03

Contractual Security Requirements

Standard security clauses and data protection requirements for vendor contracts, calibrated by vendor tier. Includes incident notification requirements, audit rights, data handling obligations, and termination provisions.

04

Vendor Lifecycle Workflows

Documented processes for vendor onboarding (security review, risk acceptance, contract requirements), ongoing monitoring (reassessment triggers, continuous monitoring), and offboarding (access revocation, data retrieval, deletion verification).

Methodology

How the engagement works.

1

Inventory & Tiering

Weeks 1 – 2

  • Inventory existing vendor relationships across departments and business units
  • Define tiering criteria based on data access, system access, and business criticality
  • Classify vendors by risk tier
  • Identify gaps in contractual security requirements for existing vendors
2

Program Design

Weeks 2 – 4

  • Develop tiered assessment questionnaires and scoring methodology
  • Draft contractual security requirements by vendor tier
  • Design vendor onboarding, monitoring, and offboarding workflows
  • Build integration points with procurement, legal, and IT processes
3

Operationalization

Weeks 4 – 5

  • Pilot assessment process with 3-5 critical vendors
  • Refine questionnaires and workflows based on pilot feedback
  • Deliver TPRM program documentation and governance model
  • Train procurement, security, and business stakeholders on vendor lifecycle processes

Engagement Tiers

Scoped to your architecture.

Core

TPRM program for organizations with up to 50 vendors in scope. Establishes foundational vendor management capabilities.

  • Vendor inventory and tiering model
  • Tiered assessment questionnaires
  • Contractual security requirements
  • Vendor lifecycle workflows (onboarding, monitoring, offboarding)
  • Pilot assessments for 3-5 critical vendors

Scaled

TPRM program for organizations with 50+ vendors or complex supply chains. Includes automation strategy and continuous monitoring design.

  • Everything in Core
  • TPRM tool selection guidance and configuration
  • Continuous monitoring strategy (security ratings, breach intelligence)
  • Procurement process integration and workflow automation
  • Vendor risk reporting for executive and board audiences

Prerequisites

  • Access to procurement records and existing vendor contracts
  • Stakeholder availability across procurement, security, IT, and legal
  • List of known vendors with data or system access (even if incomplete)

Frequently Asked Questions

Common questions.

How do we handle vendors that refuse to complete questionnaires?

Vendor non-response is itself a risk finding. The program includes an escalation path: alternative evidence sources (SOC 2 reports, ISO certifications, security pages), risk-based acceptance criteria for the business, and contractual protections that shift liability. Some vendors warrant the risk; the program ensures that decision is documented and conscious.

Should we use a TPRM platform?

Not necessarily on day one. Many organizations buy TPRM tools before defining their program, then struggle with adoption. We recommend establishing the program, piloting with manual processes, and introducing tooling once the workflows are validated. The engagement includes tool selection guidance for when you are ready.

How do we handle the backlog of existing vendors that were never assessed?

The tiering model prioritizes the backlog. Critical-tier vendors are assessed first, followed by high-tier vendors. Medium and low-tier vendors receive streamlined assessments or are accepted with documented risk based on available evidence (SOC 2 reports, certifications). The goal is risk-proportional effort, not assessing every vendor equally.

Related Offerings

Often paired with this engagement.

Vendor Security Assessment

Independent assessment of a specific vendor when the TPRM program identifies a critical vendor requiring deeper evaluation.

Enterprise Risk Management

Integrate third-party risk into the broader enterprise risk management program and register.

Compliance Program Build

Most compliance frameworks require vendor management controls. Build both programs in a coordinated engagement.

Data Security & Classification

Data classification informs vendor tiering — vendors handling classified data require higher-tier assessment and contractual protections.

Ready to discuss this engagement?

30-minute discovery call. We will discuss your application architecture, your specific concerns, and whether this assessment is the right fit.