CS0-003 CompTIA CyberSecurity Analyst CySA+ Certification Exam Free Practice Exam Questions (2026 Updated)

A discovery scan is a type of web application scanning that involves identifying active, internet-facing web applications and their URIs, without performing any intrusive or in-depth tests. This type of scan can help to understand the scope and structure of a web application before conducting more comprehensive vulnerability scans12. References: 1: OWASP Vulnerability Scanning Tools 2: CISA Web Application Scanning

A nation-state actor is a group or individual that conducts cyberattacks on behalf of a government or a political entity. They are usually motivated by national interests, such as espionage, sabotage, or influence operations. They are often highly skilled, resourced, and persistent, and they operate with the protection or support of their state sponsors. Therefore, they are less likely to be concerned with the forensic analysis for legal action of their actions, as they are unlikely to face prosecution or extradition in their own country or by international law. They are more likely to be concerned with the detection by the MITRE ATT & CK framework, which is a knowledge base of adversary tactics and techniques based on real-world observations. The MITRE ATT & CK framework can help defenders identify, prevent, and respond to cyberattacks by nation-state actors. They are also likely to be concerned with the detection or prevention of reconnaissance activities, which are the preliminary steps of cyberattacks that involve gathering information about the target, such as vulnerabilities, network topology, or user credentials. Reconnaissance activities can expose the presence, intent, and capabilities of the attackers, and allow defenders to take countermeasures. Finally, they are likely to be concerned with the examination of their actions and objectives, which can reveal their motives, strategies, and goals, and help defenders understand their threat profile and attribution.

Outdated librariesin a legacy web applicationintroduce security vulnerabilities, as theylack modern patchesandcontain known exploits​.

Option A (Misconfigured WAF)can contribute to security issues but is notinherent to legacy applications.

Option B (Data integrity failure)is apotential impactbut not a direct cause of recurring incidents.

Option D (Insufficient logging)affects detection, but theroot causeisinsecure, outdated components.

Thus,C (Outdated libraries) is the correct answer, aslegacy applications frequently suffer from unpatched vulnerabilities​.

Determining the asset value of each system is the best action to perform first, as it helps to categorize and prioritize the systems based on the sensitivity of the data they host. The asset value is a measure of how important a system is to the organization, in terms of its financial, operational, or reputational impact. The asset value can help the security analyst to assign a risk level and a protection level to each system, and to allocate resources accordingly. The other actions are not as effective as determining the asset value, as they do not directly address the goal of promoting confidentiality, availability, and integrity of the data. Interviewing the users who access these systems may provide some insight into how the systems are used and what data they contain, but it may not reflect the actual value or sensitivity of the data from an organizational perspective. Scanning the systems to see which vulnerabilities currently exist may help to identify and remediate some security issues, but it does not help to categorize or prioritize the systems based on their data sensitivity. Configuring alerts for vendor-specific zero-day exploits may help to detect and respond to some emerging threats, but it does not help to protect the systems based on their data sensitivity.

MITRE ATT & CK is a globally accessible knowledge base of adversary tactics and techniques based on real-world observations. It is used as a foundation for the development of specific threat models and methodologies in the private sector, in government, and in the cybersecurity product and service community. It can help security professionals understand, detect, and mitigate cyber threats by providing a comprehensive framework of TTPs.

A threshold value is a parameter that defines the minimum or maximum level of a metric or event that triggers an alert. For example, a threshold value can be set to alert when the number of failed login attempts exceeds 10 in an hour, or when the CPU usage drops below 20% for more than 15 minutes. By setting a threshold value, the process can filter out irrelevant or insignificant alerts and focus on the ones that indicate a potential problem or anomaly. A threshold value can help to reduce the noise and false positives in the alert system, and improve the efficiency and accuracy of the analysis12

The output shows that the web application has a cross-origin resource sharing (CORS) header that allows any origin to access its resources. This is a security misconfiguration that could allow malicious websites to make requests to the web application on behalf of the user and access sensitive data or perform unauthorized actions. The tuning recommendation is to configure the Access-Control-Allow-Origin header to only allow authorized domains that need to access the web application’s resources. This would prevent unauthorized cross-origin requests and reduce the risk of cross-site request forgery (CSRF) attacks.

The best way to begin preparation for a report titled “What We Learned” regarding a recent incident involving a cybersecurity breach is to determine the sophistication of the audience that the report is meant for. The sophistication of the audience refers to their level of technical knowledge, understanding, or interest in cybersecurity topics. Determining the sophistication of the audience can help tailor the report content, language, tone, and format to suit their needs and expectations. Forexample, a report for executive management may be more concise, high-level, and business-oriented than a report for technical staff or peers.

Executive management and systems administration are the most likely stakeholders to receive a vulnerability scan report because they are responsible for overseeing the security posture and remediation efforts of the organization. Law enforcement, marketing, legal, and product owner are less likely to be involved in the vulnerability management process or need access to the scan results. References: Cybersecurity Analyst+ - CompTIA, How To Write a Vulnerability Assessment Report | EC-Council, Driving Stakeholder Alignment in Vulnerability Management - LogicGate

The correct answer is A. Orange team.

An orange team is a team that is involved in facilitation and training of other teams in cybersecurity. An orange team assists the yellow team, which is the management or leadership team that oversees the cybersecurity strategy and governance of an organization. An orange team helps the yellow team to understand the cybersecurity risks and challenges, as well as the roles and responsibilities of other teams, such as the red, blue, and purple teams12.

In this scenario, the analyst is conducting monitoring against an authorized team that will perform adversarial techniques. This means that the analyst is observing and evaluating the performance of another team that is simulating real-world attacks against the organization’s systems or networks. This could be either a red team or a purple team, depending on whether they are working independently or collaboratively with the defensive team345.

The analyst interacts with the team twice per day to set the stage for the techniques to be used. This means that the analyst is providing guidance and feedback to the team on how to conduct their testing and what techniques to use. This could also involve setting up scenarios, objectives, rules of engagement, and success criteria for the testing. This implies that the analyst is facilitating and training the team to improve their skills and capabilities in cybersecurity12.

Therefore, based on these descriptions, the analyst is a member of an orange team, which is involved in facilitation and training of other teams in cybersecurity.

The other options are incorrect because they do not match the role and function of the analyst in this scenario.

Option B is incorrect because a blue team is a defensive security team that monitors and protects the organization’s systems and networks from real or simulated attacks. A blue team does not conduct monitoring against an authorized team that will perform adversarial techniques, but rather defends against them345.

Option C is incorrect because a red team is an offensive security team that discovers and exploits vulnerabilities in the organization’s systems or networks by simulating real-world attacks. A red team does not conduct monitoring against an authorized team that will perform adversarial techniques, but rather performs them345.

Option D is incorrect because a purple team is not a separate security team, but rather a collaborative approach between the red and blue teams to improve the organization’s overall security. A purple team does not conduct monitoring against an authorized team that will perform adversarial techniques, but rather works with them345.

CompTIA CySA+ CS0-003 explicitly lists “proprietary systems” as an inhibitor to remediation (i.e., a common obstacle that can delay or block patching/remediation).

Why D (Proprietary systems) is most likely to cause obstacles:

Proprietary systems often require vendor-provided patches, may have restricted modification, and can create delays due to vendor response time and dependencies on vendor updates. The Secbay Press guide explains that proprietary systems can be challenging due to “restricted access, dependencies on vendor updates, and potential delays in patching.”

The Sybex Study Guide also describes that proprietary systems may not have patches available quickly (or at all), and that vendor support requirements can conflict with vulnerability management needs:Exact extract (Sybex Study Guide): “Proprietary systems… may not have patches available or may have specific requirements placed on them by vendors… creating a conflict between vulnerability management policies and functional or business requirements.”

Why the other options are less “most likely” here:

A (Not meeting an SLA) is typically an outcome (a consequence) rather than the obstacle itself. The inhibitor is the SLA constraints, not “not meeting it.” CompTIA objectives list SLA as an inhibitor, not “not meeting an SLA.”

B (Patch prioritization) is a normal vulnerability management activity, not typically categorized as an inhibitor/obstacle in the CS0-003 inhibitor list.

C (Organizational governance) is also an inhibitor (bureaucracy/change control can slow remediation), but proprietary systems are often the most “hard-blocking” because you may be unable to patch without vendor action/support. Both are valid inhibitors, but “most likely” in practice (especially in exam framing) commonly points to vendor-controlled/proprietary constraints.

References (CompTIA CySA+ CS0-003 documents / study guides used):

CompTIA CS0-003 Exam Objectives v4.0: “Inhibitors to remediation” includes proprietary systems

Secbay Press CS0-003: Proprietary systems create remediation challenges due to vendor dependency and patch delays

Sybex CS0-003 Study Guide: proprietary systems may restrict patching and vendor support requirements can block remediation

Wireshark is a network protocol analyzer that allows analysts to capture and inspect data packets traveling through a network. This makes it ideal for investigating unusual network activity, as it provides detailed insights into the nature and content of network traffic. In this case, Wireshark can help identify potentially malicious packets and understand the nature of the observed traffic. Options A (WAF) and C (EDR) are primarily used for monitoring and protecting web applications and endpoints, respectively, and Nmap (D) is typically used for network discovery and mapping, not detailed traffic analysis. According to CompTIA CySA+, packet analysis tools like Wireshark are invaluable for deep-dive investigations into network anomalies.

Agent-based scansare runlocally on hostsvia installed agents, whichsignificantly reduces network trafficwhile allowing in-depth visibility and accurate scanning. They’re ideal for bandwidth-limited or sensitive networks.

Credentialed scans (A)still transmit data over the network.

Individual scans (B)is ambiguous and not a standard term.

Baseline scans (C)focus on policy compliance, not reducing traffic.

?Reference:

Chapple & Seidl – Vulnerability Management, Chapter 6: Scanning Techniques

CS0-003 Domain 2.1 – Vulnerability Scanning Methods

The correct answers for key factors in the change management process to reduce the impact of system failures are:

D. Identify assets with dependence that could be impacted by the change.

F. Ensure that all assets are properly listed in the inventory management system.

D. Identify assets with dependence that could be impacted by the change: This is crucial in change management because understanding the interdependencies among assets can help anticipate and mitigate the potential cascading effects of a change. By identifying these dependencies, the organization can plan more effectively for changes and minimize the risk of unintended consequences that could lead to system failures.

F. Ensure that all assets are properly listed in the inventory management system: Maintaining an accurate and comprehensive inventory of assets is fundamental in change management. Knowing exactly what assets the organization possesses and their characteristics allows for better planning and impact analysis when changes are made. This ensures that no critical component is overlooked during the change process, reducing the risk of failures due to incomplete information.

Other Options:

A. Ensure users document system recovery plan prior to deployment: While documenting a system recovery plan is important, it ' s more related to disaster recovery and business continuity planning than directly reducing the impact of system failures due to changes.

B. Perform a full system-level backup following the change: While backups are essential, they are generally a reactive measure to recover from a failure, rather than a proactive measure to reduce the impact of system failures in the first place.

C. Leverage an audit tool to identify changes that are being made: While using an audit tool is helpful for tracking changes and ensuring compliance, it is not directly linked to reducing the impact of system failures due to changes.

E. Require diagrams to be completed for all critical systems: While having diagrams of critical systems is useful for understanding and managing them, it is not a direct method for reducing the impact of system failures due to changes. Diagrams are more about documentation and understanding rather than proactive change management.

Business process interruption is the inhibitor to remediation that this scenario illustrates. Business process interruption is when the remediation of a vulnerability or an incident requires the disruption or suspension of a critical or essential business process, such as the point-of-sale application. This can cause operational, financial, or reputational losses for the organization, and may outweigh the benefits of the remediation. Therefore, the organization may decide to postpone or avoid the remediation until a more convenient time, such as a change freeze window, which is a period of time when no changes are allowed to the IT environment12. Service-level agreement, degrading functionality, and proprietary system are other possible inhibitors to remediation, but they are not relevant to this scenario. Service-level agreement is when the remediation of a vulnerability or an incident violates or affects the contractual obligations or expectations of the service provider or the customer. Degrading functionality is when the remediation of a vulnerability or an incident reduces or impairs the performance or usability of a system or an application. Proprietary system is when the remediation of a vulnerability or an incident involves a system or an application that is owned or controlled by a third party, and the organization has limited or no access or authority to modify it3. References: Inhibitors to Remediation — SOC Ops Simplified, Remediation Inhibitors - CompTIA CySA+, Information security Vulnerability Management Report (Remediation…

A distributed denial-of-service (DDoS) attack is a type of cyberattack that aims to overwhelm a target’s network or server with a large volume of traffic from multiple sources. A common technique for launching a DDoS attack is to compromise DNS servers, which are responsible for resolving domain names into IP addresses. By flooding DNS servers with malicious requests, attackers can disrupt the normal functioning of the internet and prevent users from accessing external SaaS resources. Official References: https://www.eccouncil.org/cybersecurity-exchange/threat-intelligence/cyber-kill-chain-seven-steps-cyberattack/

To “test” links/attachments before they reach the mail server, the organization needs a control that can execute or detonate suspicious content in a controlled environment and observe behavior. That is exactly what sandboxing does.

Secbay Press defines sandboxing as executing suspicious files/applications in a virtualized environment to observe behavior (i.e., safe testing/detonation):

Exact extract (Secbay Press): “Joe Sandbox is a malware analysis platform that utilizes virtualized environments (sandboxing) to execute and observe the behavior of suspicious files or applications.”

The official CS0-003 objectives list Sandboxing (Joe Sandbox / Cuckoo Sandbox) under tools used to determine malicious activity, aligning with the exam’s expectation that sandboxing is used to analyze suspicious content.

Why the other choices are not correct:

B (MFA): helps protect accounts, but doesn’t “test” attachments/links.

C (DKIM): authenticates sender domain and message integrity, but doesn’t detonate or test payloads.

D (Vulnerability scan): targets hosts/services/configurations, not real-time detonation of email attachments/links.

References (CompTIA CySA+ CS0-003 documents / study guides used):

Secbay Press, CompTIA CySA+ Exam Prep Guide (CS0-003): sandboxing executes/observes suspicious files in a virtualized environment

CompTIA CySA+ CS0-003 Exam Objectives v4.0: includes sandboxing tools (Joe Sandbox, Cuckoo Sandbox)

Chapple/Seidl, CompTIA CySA+ Study Guide (CS0-003): DKIM is for verifying sender/domain integrity, not payload testing

Timeline analysis in digital forensics involves creating a chronological sequence of events based on system logs, file changes, and other forensic data. This process often uses graphical representations to illustrate and analyze how an incident unfolded over time, making it easier to identify key events and potential indicators of compromise. This approach is highlighted in CompTIA Cybersecurity Analyst (CySA+) practices as crucial for understanding the scope and sequence of a security incident. The other options do not involve chronological or graphical analysis to the extent that timeline analysis does.