ISC2 Certified Secure Software Lifecycle Professional (CSSLP) Practice Exams
About the ISC2 CSSLP exam
Exam at a glance
The ISC2 professional-tier credential built specifically around the secure software development lifecycle.
Where CSSLP fits in the ISC2 family
CSSLP is the only ISC2 certification organized end-to-end around the SDLC. It's aimed at software developers, application security architects, DevSecOps engineers, and engineering leads who own security inside the software they ship — not the broader security program (CISSP) or the day-to-day operations layer (SSCP). Strong fit for organizations adopting DevSecOps, shift-left security, OWASP SAMM, or NIST SSDF (SP 800-218).
The eight CSSLP domains
- Secure Software Concepts — ~10%
- Secure Software Lifecycle Management — ~14%
- Secure Software Requirements — ~14%
- Secure Software Architecture and Design — ~14%
- Secure Software Implementation — ~14%
- Secure Software Testing — ~12%
- Secure Software Deployment, Operations, Maintenance — ~13%
- Secure Software Supply Chain — ~9%
Core topics tested
- Secure design principles — least privilege, defense in depth, fail-secure, separation of duties, complete mediation, economy of mechanism.
- Threat modeling — STRIDE, PASTA, attack trees, abuse cases, trust boundaries.
- Secure coding standards — OWASP Top 10, OWASP ASVS, CWE Top 25, CERT secure coding standards.
- SDLC integration — waterfall, agile, scrum, kanban, DevOps; embedding security gates without blocking velocity.
- Application security testing — SAST, DAST, IAST, SCA, fuzzing, manual code review, penetration testing.
- Cryptography in applications — TLS, code signing, encryption at rest, key management, certificate lifecycle.
- Secure deployment and operations — container security, IaC scanning, secrets management, CI/CD hardening, runtime protection.
- Software supply chain — SBOM, SLSA framework, dependency vulnerabilities, build provenance, third-party risk.
- Vulnerability and incident response — CVD programs, patch management, root-cause analysis for software flaws.
Prerequisites
Four years of cumulative paid work experience in the Software Development Lifecycle (SDLC) in one or more of the eight CSSLP domains, or three years of experience plus a four-year college degree in cybersecurity or a related field. Pass without the experience and you earn the Associate of ISC2 designation with five years to gain the qualifying experience.
Why take this certification
- The only ISC2 credential built around the full SDLC. Other security certs touch software development; CSSLP is structured around it from requirements to retirement.
- Strong DevSecOps signal. As organizations shift security left and adopt NIST SSDF, CSSLP is increasingly listed as a preferred credential for application security engineers, secure-code champions, and DevSecOps leads.
- Complementary to CISSP. CISSP demonstrates breadth across the security program; CSSLP demonstrates depth in software security. Many senior application security professionals hold both.
- Accredited and recognized. ANAB-accredited under ISO/IEC 17024 and approved under U.S. DoDM 8140.03 for federal cybersecurity roles in the software development workforce.
What you'll learn for the CSSLP exam
CSSLP tests whether you can integrate security into every phase of building and operating software. Questions are scenario-driven: a development team faces a constraint (regulatory, architectural, supply-chain) and you must pick the design, control, or process change that best reduces risk without breaking the SDLC.
Knowledge areas you'll be tested on
- Secure software concepts: CIA triad applied to software, secure design principles (least privilege, defense in depth, fail-secure, separation of duties), risk management for software, privacy by design.
- SDLC management: security in waterfall vs agile vs DevOps; security gates, definition of done, training programs, OWASP SAMM and BSIMM maturity models.
- Requirements: functional vs non-functional security requirements, misuse and abuse cases, data classification, regulatory drivers (GDPR, HIPAA, PCI DSS, SOX).
- Architecture and design: threat modeling (STRIDE, PASTA, attack trees), secure architecture patterns, microservices and API security, identity and session management, secure coding patterns at the design level.
- Implementation: secure coding standards (OWASP Top 10, CWE Top 25, CERT), input validation and output encoding, error and exception handling, memory-safety pitfalls, secure use of cryptographic libraries.
- Testing: SAST, DAST, IAST, SCA, fuzzing, security test cases derived from threat models, penetration testing scope, defect tracking and risk acceptance.
- Deployment, operations, maintenance: hardened build pipelines, container and Kubernetes security, secrets management, runtime protection (WAF, RASP), logging and monitoring, patch and vulnerability management, end-of-life and decommissioning.
- Supply chain: third-party component risk, SBOM, SLSA framework levels, build provenance, vendor risk assessment, open-source license and security obligations.
Thinking patterns CSSLP tests
- Picking the answer that fits this phase of the SDLC — a control that belongs in design will be wrong if the scenario is in deployment.
- Preferring preventive controls upstream (requirements, design) over detective controls downstream (testing, operations) when both are listed.
- Recognizing when a problem is process (governance, training, gates) rather than technology (tool, library, framework).
- Balancing security with developer productivity — answers that grind delivery to a halt are usually wrong.
How the practice exams help
Each free question and every premium exam mirrors the scenario style ISC2 uses on the live test. Detailed explanations cover not just why the right answer is right but why the distractors are subtly wrong — the kind of SDLC-phase and control-type discrimination CSSLP rewards. Every attempt randomizes question and answer order so you learn the reasoning, not the position.
How to prepare for the CSSLP exam
A successful CSSLP preparation strategy combines structured study of the eight domains, hands-on familiarity with secure-coding and AppSec tooling, and deliberate practice answering scenario questions that span the full SDLC. Recommended approach:
- Study the CBK (6–10 weeks). Read the official ISC2 CSSLP exam outline and a comprehensive study guide (the Official ISC2 CSSLP CBK Reference or the Sybex "Official Study Guide"). Cover every domain — the four middle domains (Lifecycle Management, Requirements, Architecture, Implementation) carry roughly 56% of the exam between them and deserve the most attention.
- Ground yourself in the AppSec canon (2–3 weeks). Work through OWASP Top 10, OWASP ASVS, CWE Top 25, and the NIST Secure Software Development Framework (SP 800-218). These references underpin many CSSLP questions and are free.
- Practice scenario thinking (2–3 weeks). CSSLP rewards correctly placing controls in the right SDLC phase. When you read a scenario, identify the phase first, then the threat, then the control type. Build the habit of asking: "Is this answer the cheapest preventive option that doesn't break delivery?"
- Take timed practice exams (2–3 weeks). Build stamina for 3 hours and 125 questions. Track which domains pull your score down and revisit those CBK chapters. Aim for consistent 80%+ on quality practice tests before scheduling.
Recommended timeline
8–12 weeks of focused study (8–12 hours per week) is typical for working software-security professionals. Candidates coming from pure development backgrounds with limited security exposure should plan 4–6 months.
Official resources
Download the official CSSLP exam outline, the OWASP project library, and NIST SP 800-218 (SSDF). ISC2 also offers Official Online Self-Paced and Instructor-Led Training that maps directly to the live exam blueprint.
Frequently asked questions
Are these actual exam questions?
No. All Nex Arc CSSLP practice questions are original content based on the ISC2 published exam outline, the official CSSLP CBK, and real-world secure software development scenarios across all eight domains. We do not offer brain dumps or leaked questions — using or distributing real exam content violates the ISC2 Code of Ethics and can result in certification revocation.
How many questions are on the CSSLP exam?
The CSSLP exam is a linear, fixed-form test of 125 multiple-choice questions administered over 180 minutes. Unlike the CISSP, the CSSLP does not use Computerized Adaptive Testing — every candidate sees the same total number of questions.
What's the CSSLP passing score?
700 out of 1000 on a scaled scoring model. Item difficulty is factored in — not every question carries the same weight. You must demonstrate sufficient competence across every domain; weak performance in one domain can drag down an otherwise strong aggregate score.
How do I access the full CSSLP practice exam?
Click the Buy Now button in the sidebar. After payment you get instant access to 12 full-length premium practice exams with detailed explanations on every answer, plus lifetime access to updates.
What experience do I need to take the CSSLP?
ISC2 requires four years of cumulative paid work experience in the Software Development Lifecycle (SDLC) in one or more of the eight CSSLP domains, or three years of experience plus a four-year college degree in cybersecurity or a related field. Candidates who pass the exam but lack the experience earn the Associate of ISC2 designation and have five years to gain the required experience to become a full CSSLP.
How long is the CSSLP valid and how do I recertify?
CSSLP certification is valid for three years. To recertify, you must earn 90 Continuing Professional Education (CPE) credits over the three-year cycle (with a minimum of 30 per year), pay the Annual Maintenance Fee (currently $125 USD), and adhere to the ISC2 Code of Ethics. CPEs can come from training, conferences, secure-coding contributions, technical writing, or higher education — re-taking the exam is not required.
What does the CSSLP exam cost and can I retake it if I fail?
The CSSLP exam fee is $599 USD globally (regional pricing may vary slightly). If you fail you must wait 30 days before retaking, 60 days for a second retake, and 90 days for any subsequent attempts. ISC2 allows a maximum of four attempts in a 12-month period, each at full price.
How does CSSLP compare to CISSP?
CSSLP and CISSP complement rather than compete. CISSP is broad security management across eight CBK domains spanning governance, networks, IAM, and operations — it's the credential CISOs and senior security generalists pursue. CSSLP is uniquely application- and code-focused: it validates that you can embed security into every phase of the SDLC, from requirements through deployment and supply-chain management. Many candidates hold both — CISSP for breadth and managerial credibility, CSSLP to prove deep software-security competence to development and DevSecOps organizations.
Which CSSLP domains are tested?
The eight domains are: Secure Software Concepts (~10%), Secure Software Lifecycle Management (~14%), Secure Software Requirements (~14%), Secure Software Architecture and Design (~14%), Secure Software Implementation (~14%), Secure Software Testing (~12%), Secure Software Deployment, Operations, Maintenance (~13%), and Secure Software Supply Chain (~9%). The middle four domains (Lifecycle Management, Requirements, Architecture, Implementation) carry the most weight — together they account for roughly 56% of the exam.
Is CSSLP a good fit for DevSecOps engineers?
Yes — arguably the best fit among ISC2 credentials. CSSLP covers SAST/DAST/IAST/SCA tooling, secure CI/CD, container security, secrets management, software supply-chain risk (SBOM, SLSA), and shift-left security practices. Organizations adopting NIST SSDF (SP 800-218) or DevSecOps frameworks often list CSSLP as a preferred credential for software security engineers, application security architects, and DevSecOps leads.