CS0-003 Vulnerability Management Practice Question
This CS0-003 practice question tests your understanding of vulnerability management. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A security analyst is reviewing vulnerability scan results and sees a critical vulnerability on a web server with a CVSS score of 9.8. The server is a legacy system that cannot be patched without causing application downtime. The business requires the application to remain available. Which of the following is the BEST course of action?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement a virtual patch using a web application firewall.
Option D is correct because a virtual patch via a web application firewall (WAF) can inspect and block exploit attempts against the vulnerability without modifying the legacy server's code or binaries. This allows the business-critical application to remain available while mitigating the 9.8 CVSS risk at the network layer, typically using signature-based or behavioral rules to intercept malicious payloads targeting the flaw.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Remove the system from the network.
Why it's wrong here
Removing the system would make it unavailable, contradicting business requirements.
✗
Disable the vulnerable service on the server.
Why it's wrong here
Disabling the service may cause application downtime and is not the best approach.
✗
Accept the risk and do nothing.
Why it's wrong here
Accepting risk is not optimal when a mitigation like virtual patching exists.
✓
Implement a virtual patch using a web application firewall.
Why this is correct
Virtual patching via WAF mitigates vulnerability while maintaining availability.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the misconception that a critical vulnerability always requires immediate patching or removal, when in reality compensating controls like a WAF virtual patch are the preferred risk treatment for legacy systems that cannot be taken offline.
Detailed technical explanation
How to think about this question
A virtual patch works by deploying a WAF rule (e.g., ModSecurity CRS or a vendor-specific signature) that inspects HTTP/HTTPS traffic for indicators of the specific vulnerability, such as a SQL injection pattern or buffer overflow attempt, and drops the malicious request before it reaches the server. This approach leverages the WAF's ability to operate at Layer 7, parsing application-layer protocols like HTTP/1.1, HTTP/2, or WebSocket, and can be updated dynamically without touching the legacy system. In practice, organizations often use this for end-of-life systems like Windows Server 2003 or Apache 2.2 where patches are unavailable.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CS0-003 question in full detail.
Vulnerability Management — This question tests Vulnerability Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Implement a virtual patch using a web application firewall. — Option D is correct because a virtual patch via a web application firewall (WAF) can inspect and block exploit attempts against the vulnerability without modifying the legacy server's code or binaries. This allows the business-critical application to remain available while mitigating the 9.8 CVSS risk at the network layer, typically using signature-based or behavioral rules to intercept malicious payloads targeting the flaw.
What should I do if I get this CS0-003 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This CS0-003 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CS0-003 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.