BSI TR-03185-2: Compliance hurdle or strategic lever for your market advantage?

Not just an IT topic

The new oneBSI guideline TR-03185-2for Open Source Software (OSS) is a management task. It defines the rules for the secure use of OSS and has a direct impact on business risk, liability and competitiveness.

Harbinger of the Cyber Resilience Act (CRA)

This directive anticipates the mandatory requirements of the comingEU Cyber Resilience Act. Anyone who acts now will secure a decisive lead in the European market.

Risk becomes an opportunity

Systematically securing your software supply chain is not a cost factor, but an investment. Not only do you minimize liability risks, you build trust with customers and accelerate safe innovations.

The invisible danger in your value chain

Do you use open source software? The rhetorical question is unnecessary. OSS is the foundation of the modern digital economy and is in almost every application your company develops, buys or operates. But this dependency creates a massive, often uncontrolled attack surface. Any unmanaged OSS component is a potential time bomb, an incalculable risk to your operations, your reputation, and ultimately your bottom line.

The crucial question is not whether, but how you manage this risk.

Why classic approaches are now failing: insights from practice

From over 20 years of experience in cybersecurity, we can say with certainty: most companies still treat OSS security as a technical problem that is delegated to the IT department. This is a fatal strategic mistake. BSI TR-03185-2 makes it unmistakably clear:

The responsibility for the secure software life cycle lies with company management.

Counter-intuitive truth:The BSI TR-03185-2 is a gift. In a landscape of growing threats and unclear liability issues, it provides a clear, field-tested roadmap for turning chaos into control and risk into competitive advantage.

From regulatory obligation to strategic choice

The TR-03185-2 is the bridge to the upcoming, strict requirements of the EU Cyber Resilience Act (CRA) andthe NIS2 directive. While your competitors may still be struggling to understand the minimum legal requirements, you can already demonstrate that your products and services are proven to be safe.

Your benefit:You proactively reduce liability risks, pass audits effortlessly and position yourself as a trustworthy partner in the market.

The Return on Security Investment (ROSI)

Viewing security as a mere cost item is an outdated view. The implementation of a Secure Software Development Lifecycle (SSDLC), as required by the BSI guidelines, generates measurable added value.

Increased efficiency

Bugs found early in the development process are exponentially cheaper to fix.

Speed of innovation

An established, secure framework allows your development teams to use OSS faster and without security concerns.

Market differentiation

Demonstrable security is increasingly becoming a decisive purchase criterion. You create a strong selling point that creates trust and retains customers.

The C-Level Playbook: Your 3-Step Action Plan

The implementation is not a major technical project, but a question of strategic control.

1. Redefine responsibility

Make OSS security a top priority. Appoint a central person who reports directly to management and controls implementation throughout the organization. This is not just a CISO job; it affects product development, law and finance.

2. Create transparency and establish processes

You can't protect what you don't know. Run oneSoftware Bill of Materials (SBOM)to get a complete overview of all OSS components used. Based on this, establish processes for continuous monitoring and rapid updating of new vulnerabilities.

3. Embed a culture of safety

The best policy is ineffective without the right culture. Promote security awareness throughout the organization - from management to developers.Invest in trainingand make security an integral part of your DNA.

Strategic relevance for the management level

For CEOs & Managing Directors

It's about ensuring business continuity, minimizing corporate risks and strengthening brand value. The TR-03185-2 is a tool for strategic company security.

For CFOs

This is active risk management. You avoid incalculable costs due to security incidents, fines and lost business. At the same time, you are investing in the future viability of the company.

For CTOs & CIOs

The guideline provides the necessary framework to combine innovation and agility with stability and security. They create the basis for a resilient and scalable IT landscape.

Conclusion: Act now before you have to act

BSI TR-03185-2 marks a turning point. The careless use of open source software is over. Decision makers now have the choice:

Do you see this development as another regulatory burden or do you recognize the strategic opportunity that lies hidden in it?

Don't wait until the legislature forces you to act. Start taking back control of your software supply chain today. Discuss this article in your next management meeting. The first step in turning risk into market advantage is deciding to take the lead.

Contact us for an initial non-binding consultation!

Next step: Free initial consultation

📖 Also read:SBOM – The new obligation for software security? Increase the security of your supply chain.

📖 Also read:SBOM – The new obligation for software security? Increase the security of your supply chain.

📖 Also read:Digital attack surfaces in the car: BSI warns of the new reality in road traffic

Would you like to strategically anchor IT security in your company? Our experts will be happy to advise you - without obligation and in a practical manner.Arrange an initial consultation now →

BSI TR-03185-1 vs. BSI TR-03185-2: The Differences

BSI TR-03185 consists of two parts targeting different audiences. Part 1 (BSI TR-03185-1) was published in 2024 and addresses manufacturers of proprietary software. It defines requirements across the entire software lifecycle: from a secure Software Development Lifecycle (SDLC) and threat modeling during the design phase to secure coding guidelines, vulnerability management, and a structured patch process. Part 2 (BSI TR-03185-2) was released in November 2025 and targets organizations that use open-source software (OSS). It focuses on SBOM management, dependency monitoring, community contribution policies, license compliance, and vulnerability response. Together, both parts form a comprehensive framework for the secure development and use of software in Germany.

Specific Requirements of BSI TR-03185

Requirements for Software Manufacturers (TR-03185-1)

Secure SDLC: Manufacturers must implement a documented secure Software Development Lifecycle that systematically addresses security requirements at every phase — from planning and implementation through to end-of-life.

Threat Modeling in the Design Phase: Potential threats must be systematically identified and assessed during the design phase. Methods such as STRIDE or PASTA should ensure that security risks are detected and addressed early in the development process.

Secure Coding Guidelines: Binding coding guidelines must be defined and enforced to prevent common vulnerabilities such as injection attacks, insecure deserialization, or flawed authentication from the outset.

Automated Security Testing (SAST/DAST): Static and dynamic security analyses must be integrated into the CI/CD pipeline. SAST examines the source code for vulnerabilities, while DAST tests the running application for security gaps.

Vulnerability Disclosure Process: Manufacturers must establish a transparent process for reporting, assessing, and remediating security vulnerabilities — including coordinated vulnerability disclosure and timely provision of patches.

Requirements for OSS Users (TR-03185-2)

SBOM for All OSS Components: Organizations must maintain a complete Software Bill of Materials (SBOM) for all open-source components in use. This must document versions, licenses, provenance, and known vulnerabilities.

Continuous Vulnerability Monitoring: All deployed OSS components must be continuously monitored for newly disclosed vulnerabilities — through CVE databases, project security advisories, or automated scanning tools.

Defined Patch Process with SLAs: A clearly defined process for applying security updates must exist, with binding Service Level Agreements (SLAs) — for example, critical patches within 72 hours, high-severity vulnerabilities within 30 days.

License Compliance Management: Compliance with all OSS license terms must be systematically ensured. This includes identifying all licenses, verifying compatibility, and fulfilling obligations such as source code disclosure or copyright attribution.

Contribution-Back Policies: Organizations should define policies for actively participating in OSS projects. This includes clear rules for bug reports, patch contributions, and collaboration with the open-source community — also to strengthen the long-term security of the components in use.

BSI TR-03185 and the Cyber Resilience Act (CRA)

BSI TR-03185 is closely connected to the EU Cyber Resilience Act (CRA), which introduces mandatory cybersecurity requirements for all products with digital elements on the European market for the first time. The BSI technical guideline can be understood as a German implementation aid for key CRA requirements: organizations that comply with TR-03185 already cover essential core areas of the CRA.

Specifically, the requirements overlap in three key areas: First, the CRA, like TR-03185, requires the creation and maintenance of a Software Bill of Materials (SBOM) for all products. Second, the CRA demands structured vulnerability handling — from detection through reporting to remediation — which directly corresponds to the TR-03185 requirements for vulnerability management and disclosure. Third, the CRA mandates update obligations ensuring that security updates are provided promptly and free of charge — analogous to the patch process defined in TR-03185.

The timeline alignment is also important: from September 2026, the CRA's reporting obligations for actively exploited vulnerabilities take effect, and from December 2027, all products must meet the full CRA requirements. Organizations that begin implementing BSI TR-03185 now are building a solid foundation for CRA compliance and avoiding last-minute scrambles.

Implementation Roadmap: BSI TR-03185 in 5 Steps

Step 1 — Inventory: Create a complete inventory of all software in use — both proprietary and open source. Record versions, purposes, responsibilities, and dependencies. Without this foundation, no targeted implementation is possible.

Step 2 — Gap Analysis: Systematically compare your current state against BSI TR-03185 requirements. Identify gaps in areas such as SDLC documentation, vulnerability management, SBOM completeness, and patch processes. Prioritize gaps by risk and effort.

Step 3 — SBOM Implementation: Implement Software Bill of Materials management. Use standardized formats such as CycloneDX or SPDX. Integrate SBOM generation into your build pipelines and ensure SBOMs are updated with every release.

Step 4 — Define Processes: Establish documented processes for vulnerability management, patch management, and incident response. Define clear responsibilities, escalation paths, and SLAs. Train your teams and embed the processes into daily operations.

Step 5 — Continuous Monitoring: Set up continuous monitoring: automated vulnerability scans, regular SBOM audits, KPI tracking for patch times and compliance status. Conduct periodic reviews and adapt your processes to new threats and regulatory changes.

BSI TR-03185-1 vs. BSI TR-03185-2: The Differences

BSI TR-03185 consists of two parts targeting different audiences. Part 1 (BSI TR-03185-1) was published in 2024 and addresses manufacturers of proprietary software. It defines requirements across the entire software lifecycle: from a secure Software Development Lifecycle (SDLC) and threat modeling during the design phase to secure coding guidelines, vulnerability management, and a structured patch process. Part 2 (BSI TR-03185-2) was released in November 2025 and targets organizations that use open-source software (OSS). It focuses on SBOM management, dependency monitoring, community contribution policies, license compliance, and vulnerability response. Together, both parts form a comprehensive framework for the secure development and use of software in Germany.

Specific Requirements of BSI TR-03185

Requirements for Software Manufacturers (TR-03185-1)

Secure SDLC: Manufacturers must implement a documented secure Software Development Lifecycle that systematically addresses security requirements at every phase — from planning and implementation through to end-of-life.

Threat Modeling in the Design Phase: Potential threats must be systematically identified and assessed during the design phase. Methods such as STRIDE or PASTA should ensure that security risks are detected and addressed early in the development process.

Secure Coding Guidelines: Binding coding guidelines must be defined and enforced to prevent common vulnerabilities such as injection attacks, insecure deserialization, or flawed authentication from the outset.

Automated Security Testing (SAST/DAST): Static and dynamic security analyses must be integrated into the CI/CD pipeline. SAST examines the source code for vulnerabilities, while DAST tests the running application for security gaps.

Vulnerability Disclosure Process: Manufacturers must establish a transparent process for reporting, assessing, and remediating security vulnerabilities — including coordinated vulnerability disclosure and timely provision of patches.

Requirements for OSS Users (TR-03185-2)

SBOM for All OSS Components: Organizations must maintain a complete Software Bill of Materials (SBOM) for all open-source components in use. This must document versions, licenses, provenance, and known vulnerabilities.

Continuous Vulnerability Monitoring: All deployed OSS components must be continuously monitored for newly disclosed vulnerabilities — through CVE databases, project security advisories, or automated scanning tools.

Defined Patch Process with SLAs: A clearly defined process for applying security updates must exist, with binding Service Level Agreements (SLAs) — for example, critical patches within 72 hours, high-severity vulnerabilities within 30 days.

License Compliance Management: Compliance with all OSS license terms must be systematically ensured. This includes identifying all licenses, verifying compatibility, and fulfilling obligations such as source code disclosure or copyright attribution.

Contribution-Back Policies: Organizations should define policies for actively participating in OSS projects. This includes clear rules for bug reports, patch contributions, and collaboration with the open-source community — also to strengthen the long-term security of the components in use.

BSI TR-03185 and the Cyber Resilience Act (CRA)

BSI TR-03185 is closely connected to the EU Cyber Resilience Act (CRA), which introduces mandatory cybersecurity requirements for all products with digital elements on the European market for the first time. The BSI technical guideline can be understood as a German implementation aid for key CRA requirements: organizations that comply with TR-03185 already cover essential core areas of the CRA.

Specifically, the requirements overlap in three key areas: First, the CRA, like TR-03185, requires the creation and maintenance of a Software Bill of Materials (SBOM) for all products. Second, the CRA demands structured vulnerability handling — from detection through reporting to remediation — which directly corresponds to the TR-03185 requirements for vulnerability management and disclosure. Third, the CRA mandates update obligations ensuring that security updates are provided promptly and free of charge — analogous to the patch process defined in TR-03185.

The timeline alignment is also important: from September 2026, the CRA's reporting obligations for actively exploited vulnerabilities take effect, and from December 2027, all products must meet the full CRA requirements. Organizations that begin implementing BSI TR-03185 now are building a solid foundation for CRA compliance and avoiding last-minute scrambles.

Implementation Roadmap: BSI TR-03185 in 5 Steps

Step 1 — Inventory: Create a complete inventory of all software in use — both proprietary and open source. Record versions, purposes, responsibilities, and dependencies. Without this foundation, no targeted implementation is possible.

Step 2 — Gap Analysis: Systematically compare your current state against BSI TR-03185 requirements. Identify gaps in areas such as SDLC documentation, vulnerability management, SBOM completeness, and patch processes. Prioritize gaps by risk and effort.

Step 3 — SBOM Implementation: Implement Software Bill of Materials management. Use standardized formats such as CycloneDX or SPDX. Integrate SBOM generation into your build pipelines and ensure SBOMs are updated with every release.

Step 4 — Define Processes: Establish documented processes for vulnerability management, patch management, and incident response. Define clear responsibilities, escalation paths, and SLAs. Train your teams and embed the processes into daily operations.

Step 5 — Continuous Monitoring: Set up continuous monitoring: automated vulnerability scans, regular SBOM audits, KPI tracking for patch times and compliance status. Conduct periodic reviews and adapt your processes to new threats and regulatory changes.

Frequently Asked Questions About BSI TR-03185

What is BSI TR-03185 and who does it apply to?

BSI TR-03185 is a technical guideline from the German Federal Office for Information Security for the secure software lifecycle. Part 1 targets proprietary software manufacturers, Part 2 targets organizations using open source software.

How does BSI TR-03185 relate to the Cyber Resilience Act?

BSI TR-03185 serves as a German implementation guide for the EU Cyber Resilience Act. Meeting TR-03185 requirements covers essential CRA requirements including SBOM, vulnerability management, and secure software lifecycle.