When investors and acquirers talk about assessing a technology target before signing, two terms come up repeatedly: technology due diligence and cybersecurity due diligence. They are related — but they are not the same thing. And treating them as interchangeable is one of the most common gaps in how technology risk gets assessed during M&A.

Understanding the distinction, and the overlap, helps you ensure that nothing material falls through the cracks before you commit.

What Technology Due Diligence Covers

Technology due diligence is a comprehensive assessment of everything under the hood of a software or technology business. It examines whether the platform is well-built, maintainable, scalable, and fit for the acquirer’s purposes. A thorough TDD typically covers:

• Architecture and design — is the platform built on sound structural foundations? Can it scale? Is it extensible?
• Code quality and technical debt — how clean is the codebase? How much accumulated debt will slow future development?
• Infrastructure and reliability — how is the platform hosted? What are the disaster recovery and business continuity arrangements?
• Engineering team and processes — is the team well-organised? Is knowledge appropriately distributed? Are development practices mature?
• Dependencies and third-party risk — what open source components, cloud providers, and third-party integrations does the platform rely on?

Security is a component of technology due diligence — but in a standard TDD, it is assessed at the level of application security posture, compliance certifications, and known vulnerability exposure. It is not a full, standalone cybersecurity assessment.

What Cybersecurity Due Diligence Covers

Cybersecurity due diligence is a dedicated, in-depth assessment of a target’s security posture — going substantially deeper into the security layer than a standard TDD. It examines:

• Vulnerability assessment — systematic identification of exploitable weaknesses across the application, infrastructure, and network layers
• Penetration testing — active, adversarial testing of the platform to identify how an attacker could gain access, escalate privileges, or exfiltrate data
• Identity and access management — how are user accounts, admin privileges, and system access controlled? Is MFA enforced? Are offboarding processes robust?
• Incident history and response capability — has the company experienced breaches? How were they handled? Is there a tested incident response plan?
• Compliance and regulatory posture — does the platform meet the requirements of applicable frameworks such as GDPR, HIPAA, PCI DSS, SOC 2, or ISO 27001?
• Third-party and supply chain security — how are vendor risks managed? What is the security posture of key technology dependencies?

Where TDD gives you a broad view of the technology, cybersecurity due diligence gives you a deep view of the security layer specifically — including active testing that a standard TDD does not include.

Where They Overlap

The boundary between the two is not a hard line. Several areas sit squarely in the overlap:

Authentication and access controls appear in both assessments — TDD examines them as part of architecture; cybersecurity DD examines them in depth as a primary attack vector.

Third-party dependencies feature in both — TDD from a technical debt and maintainability perspective; cybersecurity DD from a vulnerability and supply chain risk perspective.

Compliance certifications are reviewed in both — TDD as a signal of operational maturity; cybersecurity DD as evidence of specific security controls being in place.

Infrastructure posture is assessed in both — TDD for reliability and scalability; cybersecurity DD for exposure and hardening.

This overlap is a feature, not a bug. When TDD and cybersecurity DD are conducted together — as they should be for any significant technology acquisition — the findings from each inform and validate the other. A vulnerability identified during pen testing can shed new light on an architectural decision. A compliance gap identified during TDD can direct the focus of the security assessment.

Why the Distinction Matters

The practical implication is straightforward: a technology due diligence alone is not a substitute for cybersecurity due diligence, and vice versa.

An acquirer who commissions only a TDD will get a comprehensive view of the platform’s quality and risk profile — but may not have the depth of security assessment needed to understand their exposure to breach, regulatory penalty, or reputational damage.

An acquirer who commissions only a cybersecurity assessment will understand the security posture in depth — but will miss the architectural, code quality, scalability, and engineering team risks that TDD surfaces.

For acquisitions where technology is the core asset — SaaS platforms, AI businesses, software companies of any kind — both are needed. The question is how they are scoped and sequenced, not whether to do them.

How to Approach Both in a Single Engagement

The most efficient approach is to integrate cybersecurity assessment into the technology due diligence process from the outset — treating security not as a separate workstream but as a dedicated dimension of a single, comprehensive assessment.

This is how VeryDiligent approaches every engagement. Our standard TDD covers security posture, compliance certifications, authentication controls, and known vulnerability exposure as part of the core scope. Where a target cannot provide a recent penetration testing report from a trusted third party, we offer penetration testing as an additional service — ensuring that the security assessment has the depth the situation requires.

The result is a single, integrated view of technology risk — covering architecture, code, infrastructure, engineering team, and security — delivered within your deal timeline and structured to inform both deal pricing and post-close planning.

Contact us today to discuss the right scope for your upcoming transaction.

Related reading: Cybersecurity Due Diligence: The New Dealbreaker | Technology Due Diligence vs Technical Due Diligence: What’s the Difference? | Our Framework for Technology Due Diligence Explained