ISC2 · CSSLP
Certified Secure Software Lifecycle Professional (CSSLP) Practice Tests
The CSSLP validates that software professionals have the expertise to incorporate security practices—authentication, authorization, and auditing—into each phase of the software development lifecycle (SDLC). It is designed for software developers, engineers, architects, and security professionals with at least four years of SDLC experience.
Exam Details
Practice Questions
841
≈ 6 practice exams
Duration
180 minutes
Passing Score
700/1000
Difficulty
ProfessionalLast Updated
Mar 2026
Topics Covered
Secure Software ConceptsSecure Software Lifecycle ManagementSecure Software RequirementsSecure Software Architecture and DesignSecure Software ImplementationSecure Software TestingSecure Software Deployment, Operations, MaintenanceSecure Software Supply Chain
Certified Secure Software Lifecycle Professional (CSSLP) Practice Exam Preparation
Use this CSSLP practice exam to prepare for Certified Secure Software Lifecycle Professional (CSSLP) with realistic questions, detailed explanations, and focused study modes. The practice bank includes 841 questions for ISC2 CSSLP, so you can review the exam steadily instead of relying on one long cram session.
As you practice, pay extra attention to recurring topics such as Secure Software Concepts, Secure Software Lifecycle Management, Secure Software Requirements, Secure Software Architecture and Design, and Secure Software Implementation. Start with short sessions to identify weak areas, then move into timed quizzes once your accuracy is consistent.
The explanations are especially useful when you want to connect exam wording to the responsibilities and scenarios described in the official certification guidance. Use the free preview first, then unlock the full question bank when you are ready to build a complete study routine.
Exam Domain Breakdown
Secure Software Concepts12%
Secure Software Lifecycle Management11%
Secure Software Requirements13%
Secure Software Architecture and Design15%
Secure Software Implementation14%
Secure Software Testing14%
Secure Software Deployment, Operations, and Maintenance11%
Secure Software Supply Chain10%
Exam Overview
The Certified Secure Software Lifecycle Professional (CSSLP) is an advanced, vendor-neutral credential issued by ISC2 that validates a practitioner's ability to embed security practices—including authentication, authorization, and auditing—throughout every phase of the software development lifecycle (SDLC). The certification covers eight tightly scoped domains ranging from foundational secure software concepts and requirements gathering through architecture, implementation, testing, deployment, and supply chain security, ensuring holders can address risk at every stage rather than bolting on security after the fact.
Accredited under ANSI/ISO/IEC Standard 17024 and approved under U.S. DoD Manual 8140.03, the CSSLP carries formal recognition in both the private sector and defense contracting environments. ISC2 regularly updates the exam through a Job Task Analysis (JTA) process, keeping the content aligned with current industry practice. The most recent exam outline places the heaviest emphasis on Secure Software Architecture and Design (15%), Secure Software Implementation (14%), and Secure Software Testing (14%), reflecting where the most consequential security decisions are made during development.
Who Should Take This Exam
The CSSLP is intended for experienced software and security professionals who bear responsibility for security outcomes across the development lifecycle. Primary candidates include software architects, software engineers, application security specialists, security engineers, and software program managers who work directly in development organizations. Secondary audiences include quality assurance testers, penetration testers, software procurement analysts, project managers, security managers, and IT directors who oversee software delivery or vendor relationships.
Candidates typically have four or more years of hands-on SDLC experience and are already working in roles where they make or influence security design decisions. The certification is particularly well-suited for professionals transitioning from pure development into security-focused engineering roles, or for AppSec practitioners who want a globally recognized credential to formalize their expertise.
Prerequisites
ISC2 requires a minimum of four years of cumulative, paid, full-time professional work experience in one or more of the eight CSSLP CBK domains. Candidates who hold a four-year degree in Computer Science, Information Technology, or a related field may substitute one year of that experience requirement, reducing the minimum to three years. There are no formal prerequisites requiring other certifications before sitting the exam.
Beyond the experience requirement, candidates are expected to have working familiarity with secure coding practices, threat modeling methodologies such as STRIDE or PASTA, cryptographic concepts, access control models, and at least one SDLC methodology (e.g., Agile, DevSecOps, waterfall). Professionals without the required experience at exam time can pass the exam and become an Associate of ISC2, with five years to accumulate the qualifying work experience before converting to full CSSLP status. All certified members must adhere to the ISC2 Code of Ethics.
Exam Format
The CSSLP exam consists of 125 multiple-choice questions delivered over a 180-minute (3-hour) time limit. All questions are multiple-choice in format; ISC2 does not currently publish information about unscored pretest items for this exam. The exam is administered through Pearson VUE testing centers worldwide as well as via online proctored delivery, giving candidates flexibility in how and where they test.
Scoring uses a scaled model with a maximum of 1,000 points; the passing score is 700. The exam fee is $599 USD. The certification must be maintained with 90 Continuing Professional Education (CPE) credits earned over a three-year cycle, plus an Annual Maintenance Fee (AMF) of $125 per year. The exam is accredited under ANSI/ISO/IEC 17024 standards.
Skills Measured
- 1.Domain 1 – Secure Software Concepts (12%): Core security principles including confidentiality, integrity, and availability (CIA triad); authentication mechanisms such as MFA, SSO, and biometrics; foundational design principles including least privilege, defense in depth, and fail-secure.
- 2.Domain 2 – Secure Software Lifecycle Management (11%): Integration of security into development methodologies (Agile, DevSecOps, waterfall); adoption of security standards and frameworks; security metrics definition; risk management integration; application decommissioning procedures.
- 3.Domain 3 – Secure Software Requirements (13%): Eliciting and documenting functional and non-functional security requirements; compliance identification (regulatory, contractual); data classification and handling requirements; privacy requirements; security requirements for third-party and vendor components.
- 4.Domain 4 – Secure Software Architecture and Design (15%): Security architecture patterns and reference models; threat modeling using methodologies such as STRIDE and PASTA; designing for cloud, IoT, mobile, and embedded environments; interface security; attack surface analysis.
- 5.Domain 5 – Secure Software Implementation (14%): Secure coding standards and practices; input validation and output encoding; cryptography selection and implementation; access control enforcement; static code analysis; vulnerability identification and remediation during development.
- 6.Domain 6 – Secure Software Testing (14%): Security test strategy and planning; dynamic application security testing (DAST) and interactive application security testing (IAST); penetration testing methodologies; fuzz testing; test data protection; security regression testing.
- 7.Domain 7 – Secure Software Deployment, Operations, and Maintenance (11%): Secure CI/CD pipeline configuration; configuration and change management; incident response procedures; patch and vulnerability management; continuous security monitoring; business continuity and disaster recovery planning.
- 8.Domain 8 – Secure Software Supply Chain (10%): Third-party and open-source component risk management; vendor security assessment; software bill of materials (SBOM); pedigree and provenance verification; contractual security requirements for suppliers; software acquisition security.
Study Tips
- Start with the official ISC2 CSSLP Exam Outline (available at isc2.org) and use the published domain weights to allocate study time—spend proportionally more time on Architecture & Design (15%), Implementation (14%), and Testing (14%) as these carry the highest combined weight.
- Use the Official ISC2 CSSLP Study Guide (published by Wiley/Sybex) as your primary reference. It maps directly to the CBK domains and is the most authoritative self-study resource; supplement with ISC2's official flashcards and practice quizzes available on the ISC2 self-study resources page.
- Practice threat modeling hands-on: work through STRIDE and PASTA exercises using real or sample application architectures. Domain 4 (Architecture & Design) expects applied knowledge of threat modeling, not just theoretical familiarity.
- Take ISC2's official instructor-led or online self-paced training course if your budget allows—these courses are built from the same CBK the exam tests, and the adaptive learning platform helps identify knowledge gaps before exam day.
- For Domain 8 (Supply Chain), study NIST SP 800-161 (Cybersecurity Supply Chain Risk Management) and OWASP's guidance on software composition analysis, as supply chain security has grown significantly in exam weight and real-world importance.
- Practice with timed sets of 125 questions to build endurance for the 3-hour exam. Many candidates find time management challenging; use ISC2's official practice quizzes and third-party question banks to simulate full exam conditions at least 2–3 times before your test date.
- Approach questions from the perspective of an experienced security practitioner advising an organization—ISC2 exam questions are frequently scenario-based and test judgment and best-practice application, not just memorization of facts.
Career Benefits
According to ISC2's Cybersecurity Workforce Study, CSSLP-certified professionals earn an average of $147,375 annually in North America, $138,242 in Europe, and $115,803 globally. The certification qualifies holders for roles including software security architect, application security engineer, senior software engineer, security program manager, penetration tester, and CISO-track leadership positions. Foote Partners has ranked CSSLP among the top IT credentials that increased in pay premium, with certified professionals reporting earnings approximately 13% higher than non-certified peers in comparable roles.
Demand for CSSLP holders is driven by regulatory pressure (PCI DSS, HIPAA, FedRAMP), widespread adoption of DevSecOps practices, and the DoD's 8140 workforce framework, which lists CSSLP as an approved credential for cyberspace work roles. The certification differentiates candidates from those holding purely development-focused credentials by demonstrating security competence across the full lifecycle—making it particularly valuable in industries such as defense contracting, financial services, healthcare technology, and cloud-native software companies where secure-by-design is a contractual or compliance requirement.
Sample Questions
5 sample questions with answers and explanations. The full bank has 841 questions, enough for 6 full-length practice exams.
Preview — answers shown1. An organization implements SAMM to establish software security maturity goals. The security team must explain how SAMM differs from BSIMM when executives ask which model to follow. Which statement correctly distinguishes these frameworks? (Select one!)
ASAMM requires a dedicated Software Security Group while BSIMM uses distributed Security Champions
BBSIMM is descriptive and benchmarks against real organizations while SAMM is prescriptive and allows setting custom maturity targets
CBSIMM defines 5 CMMI-style maturity levels while SAMM uses 122 discrete activity measurements
DSAMM is descriptive and measures what organizations currently do while BSIMM is prescriptive and defines target practices
Explanation
BSIMM is a descriptive model that measures and benchmarks software security practices across 128+ real organizations, showing what companies actually do. SAMM is a prescriptive model providing guidance on what organizations should do, allowing them to set risk-driven custom maturity targets across 3 levels. The first option reverses these definitions. Both frameworks can use SSGs and Security Champions. BSIMM defines 4 domains with 122+ activities while SAMM defines 5 business functions with 3 maturity levels.
2. Adatum's operations team needs to securely decommission solid-state drives that stored encryption keys used to protect classified government data. The drives must be sanitized so that data recovery is infeasible even with state-of-the-art laboratory techniques. The team consults NIST SP 800-88 guidelines to determine the appropriate sanitization method. Which sanitization method meets this requirement for solid-state drives? (Select one!)
APurge the drives using degaussing to eliminate all magnetic data remnants from the solid-state storage media
BPurge the drives using the manufacturer's built-in cryptographic erase command to destroy the encryption keys, making the encrypted data unrecoverable
CDestroy the drives through physical disintegration or incineration to render data recovery from the storage media infeasible
DClear the drives using logical overwriting techniques that write patterns to all user-addressable storage locations on the SSD
Explanation
For solid-state drives containing classified government data where recovery must be infeasible even with state-of-the-art laboratory techniques, physical destruction through disintegration, incineration, or pulverization is the appropriate method under NIST SP 800-88. Destroy is the most definitive sanitization method, ensuring no data can be recovered regardless of the storage technology. Clearing through logical overwriting provides protection against simple recovery tools but is insufficient for classified data because SSDs use wear leveling, over-provisioning, and spare blocks that may retain data even after overwrite commands, making complete clearing unreliable. Cryptographic erase through purging destroys encryption keys rather than the data itself and can be effective if the cryptographic implementation is verified to be strong, but for classified government data, organizations typically require physical destruction to provide the highest assurance. Degaussing is ineffective for solid-state drives because SSDs store data using electrical charges in flash memory cells, not magnetic domains, so magnetic field exposure has no effect on the stored data.
3. A development team implements session management for a web application. The application generates session tokens using a cryptographically secure random number generator and stores them in cookies with Secure and HttpOnly flags. However, the application does not invalidate sessions after password changes or privilege escalations. Which OWASP Top 10 2021 category does this implementation gap represent? (Select one!)
AA05:2021 - Security Misconfiguration because cookie security attributes are incorrectly configured
BA02:2021 - Cryptographic Failures because session tokens lack sufficient entropy
CA08:2021 - Software and Data Integrity Failures because session state integrity is not maintained
DA07:2021 - Identification and Authentication Failures because session lifecycle management is incomplete
Explanation
Failure to invalidate sessions after authentication or authorization changes represents Identification and Authentication Failures under OWASP A07:2021. Proper session lifecycle management requires invalidating sessions when security-critical account changes occur such as password resets, permission changes, or logout. This prevents session fixation attacks and ensures stolen session tokens become invalid after credential changes. Cryptographic Failures would involve weak random number generation or insufficient token length, which is not the case here. Security Misconfiguration relates to system-level configuration issues, not application logic for session invalidation. Software and Data Integrity Failures primarily concern unsigned code and insecure deserialization, not session management.
4. An organization adopts OWASP Top 10:2021 for secure development training. A developer argues that a SQL injection vulnerability can be fixed during implementation without changing the design. A security architect responds that this represents an implementation flaw, not a design flaw. Which statement correctly distinguishes between A04:2021 Insecure Design and implementation vulnerabilities? (Select one!)
AInsecure design occurs when security controls fail due to coding errors, while implementation flaws result from missing threat modeling
BImplementation flaws like SQL injection can be fixed through secure coding, while insecure designs lack foundational security controls that cannot be added through better implementation
CImplementation flaws affect only individual components, while insecure design affects the entire application equally
DBoth insecure design and implementation flaws require complete architectural redesign to remediate properly
Explanation
The critical distinction is that insecure design represents missing or ineffective control design at the architectural level that cannot be fixed by perfect implementation. A secure design can still have implementation defects like SQL injection that may be exploited, but these can be remediated through secure coding practices such as parameterized queries. An insecure design lacks the foundational security controls needed to defend against specific attacks, requiring architectural changes. SQL injection is an implementation flaw correctable through coding practices. Insecure design does not result from coding errors but from inadequate security requirements and threat modeling during the design phase. Not all flaws require complete redesign, and insecure design does not affect all components equally.
5. A cryptographic engineer designs encryption for a secure messaging application. The team evaluates symmetric cipher modes for message confidentiality. ECB mode is rejected immediately. The architect recommends GCM mode over CBC mode for production deployment. What is the PRIMARY security advantage of GCM mode? (Select one!)
AGCM is compatible with older systems and protocols that do not support modern cipher modes
BGCM eliminates the need for initialization vectors, simplifying key management
CGCM provides smaller ciphertext output size, reducing storage and bandwidth requirements
DGCM provides authenticated encryption with both confidentiality and integrity in a single operation
Explanation
GCM (Galois/Counter Mode) is an Authenticated Encryption with Associated Data mode that provides both confidentiality through encryption and integrity through authentication tags in a single cryptographic operation. This makes GCM the recommended choice for modern applications. CBC mode provides only confidentiality and is vulnerable to padding oracle attacks when used without separate integrity protection. GCM does not produce smaller ciphertext; the authentication tag actually adds overhead. GCM still requires initialization vectors (nonces) for security, and proper IV management is critical. GCM is a modern mode with less compatibility with older systems compared to CBC. ECB mode is correctly rejected because identical plaintext blocks produce identical ciphertext blocks, revealing patterns. The authenticated encryption property of GCM is its defining security advantage.
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