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CompTIA CS0-003 Exam Actual Questions
CompTIA CySA+ (CS0-003) (Page 4 )

Updated On: 13-Jun-2026
Page 4 of 73
PDF with 571 Questions

The security team reviews a web server for XSS and runs the following Nmap scan:



Which of the following most accurately describes the result of the scan?

  1. An output of characters > and " as the parameters used in the attempt
  2. The vulnerable parameter ID http://172.31.15.2/1.php?id=2 and unfiltered characters returned
  3. The vulnerable parameter and unfiltered or encoded characters passed > and " as unsafe
  4. The vulnerable parameter and characters > and " with a reflected XSS attempt

Answer(s): D

Explanation:

The Nmap script is specifically designed to test for XSS. The output shows that the characters necessary to close a tag (") and start a new tag (>) were reflected (meaning they appeared unfiltered in the output), which confirms the presence of a Reflected XSS vulnerability. The output focuses on characters > " ' because these are the characters required to break out of an HTML element or attribute and inject script code.



Which of the following is the best action to take after the conclusion of a security incident to improve incident response in the future?

  1. Develop a call tree to inform impacted users
  2. Schedule a review with all teams to discuss what occurred
  3. Create an executive summary to update company leadership
  4. Review regulatory compliance with public relations for official notification

Answer(s): B

Explanation:

Option B is correct because post-incident reviews (lessons learned) with all teams improve coordination, identify gaps, and update IR playbooks for continuous improvement. A) Develop a call tree addresses notification, not incident learning. C) Executive summaries inform leadership but do not drive operational improvements. D) Reviewing regulatory compliance with PR focuses on public messaging, not IR process refinement. Correct — emphasizes cross-functional debrief to enhance future incident response capabilities.



A security analyst received a malicious binary file to analyze. Which of the following is the best technique to perform the analysis?

  1. Code analysis
  2. Static analysis
  3. Reverse engineering
  4. Fuzzing

Answer(s): C

Explanation:

Option C is correct because reverse engineering involves examining a binary executable to understand its behavior, capabilities, and potential threats without the source code, which is essential for analyzing a malicious binary. A) Incorrect — Code analysis typically requires source code; not applicable to a binary without decompilation. B) Incorrect — Static analysis can be applied to binaries but is less thorough than deliberate reverse engineering for behavior, callbacks, and obfuscated code. D) Incorrect — Fuzzing tests inputs to find crashes, not detailed analysis of a given binary’s behavior.



An incident response team found IoCs in a critical server. The team needs to isolate and collect technical evidence for further investigation. Which of the following pieces of data should be collected first in order to preserve sensitive information before isolating the server?

  1. Hard disk
  2. Primary boot partition
  3. Malicious files
  4. Routing table
  5. Static IP address

Answer(s): D

Explanation:

Option D is correct because preserving the routing table during containment helps maintain evidence of network paths, interfaces, and potential exfiltration routes, which is critical for timeline and lineage before isolating the host. A) Hard disk—imaging is important but not the first for preserving volatile network indicators. B) Primary boot partition—riskier to access early and may alter evidence; not the priority for network containment. C) Malicious files—detention later; initial data should focus on live evidence. E) Static IP address—exposed by other logs; not the primary volatile data to preserve before isolation.



Which of the following security operations tasks are ideal for automation?

  1. Suspicious file analysis:
    Look for suspicious-looking graphics in a folder.



    Create subfolders in the original folder based on category of graphics found.



    Move the suspicious graphics to the appropriate subfolder
  2. Firewall IoC block actions:
    Examine the firewall logs for IoCs from the most recently published zero-day exploit



    Take mitigating actions in the firewall to block the behavior found in the logs



    Follow up on any false positives that were caused by the block rules
  3. Security application user errors:
    Search the error logs for signs of users having trouble with the security application



    Look up the user's phone number



    Call the user to help with any questions about using the application
  4. Email header analysis:
    Check the email header for a phishing confidence metric greater than or equal to five



    Add the domain of sender to the block list



    Move the email to quarantine

Answer(s): D

Explanation:

Option D is correct because automation is well-suited for analyzing email headers to determine phishing indicators, confidence metrics, and automated actions like quarantining or blocking senders, aligning with CSA/CS0-003 topics on email-based threat detection and response. A) Suspicious file analysis involves manual triage and contextual decision-making; automation can assist but often requires human judgment for categorization. B) Firewall IoC block actions are response-based controls that may require policy review and exception handling, not solely automated. C) Security application user errors involve human factors and remediation, which benefits from human review rather than full automation.



An organization has experienced a breach of customer transactions. Under the terms of PCI DSS, which of the following groups should the organization report the breach to?

  1. PCI Security Standards Council
  2. Local law enforcement
  3. Federal law enforcement
  4. Card issuer

Answer(s): D

Explanation:

Option D is correct because PCI DSS breaches involving cardholder data must be reported to the relevant card issuers (the payment brands) per PCI requirements for incident reporting and to coordinate potential card replacement and fraud mitigation.
A) Incorrect — PCI Security Standards Council is the standards body, not the breach recipient for incidents involving card data.
B) Incorrect — Reporting to local law enforcement may be prudent but is not the mandated recipient for PCI DSS breach notifications.
C) Incorrect — Federal law enforcement is not the designated recipient under PCI DSS; notification is to the card issuers/brands.



Which of the following is the best metric for an organization to focus on given recent investments in SIEM, SOAR, and a ticketing system?

  1. Mean time to detect
  2. Number of exploits by tactic
  3. Alert volume
  4. Quantity of intrusion attempts

Answer(s): A

Explanation:

Option A is correct because mean time to detect (MTTD) measures how quickly the organization identifies threats after they occur, directly reflecting the value of SIEM, SOAR, and ticketing investments in reducing dwell time and accelerating response. B is incorrect: number of exploits by tactic focuses on exploit techniques, not organizational detection or response efficiency. C is incorrect: alert volume gauges SIEM churn, not effectiveness or detection speed, and may mislead without context. D is incorrect: quantity of intrusion attempts indicates attacker activity, not the organization’s detection/response performance. Overall, MTTD aligns with improved detection efficiency post-implementation.



A company is implementing a vulnerability management program and moving from an on-premises environment to a hybrid IaaS cloud environment. Which of the following implications should be considered on the new hybrid environment?

  1. The current scanners should be migrated to the cloud
  2. Cloud-specific misconfigurations may not be detected by the current scanners
  3. Existing vulnerability scanners cannot scan IaaS systems
  4. Vulnerability scans on cloud environments should be performed from the cloud

Answer(s): B

Explanation:

Option B is correct because hybrid IaaS introduces cloud-specific misconfigurations that may not be detected by on-premises scanners; you must ensure scanners can recognize cloud controls and configurations. A) The statement overestimates migration needs; scanners may be updated but not simply migrated as-is. C) Existing scanners can often scan IaaS with proper credentials and configurations; it's not inherently impossible. D) Vulnerability scans in cloud environments can be performed from either on-premises or cloud, depending on architecture, but best practice is to scan from within the cloud or via cloud-enabled agents; the option is too prescriptive.



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