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 notices that several critical vulnerabilities have been reported on the same web server for three consecutive months. The server owner states that the patches cannot be applied due to application compatibility issues. 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 compensating controls to reduce the risk
Option D is correct because when a known vulnerability cannot be patched due to application compatibility issues, the standard risk management approach is to implement compensating controls. These controls (e.g., Web Application Firewall rules, network segmentation, or host-based IPS) reduce the likelihood or impact of exploitation without modifying the vulnerable application. This aligns with the NIST SP 800-40 Rev. 4 guidance on vulnerability handling, which explicitly recommends compensating controls when patching is not feasible.
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.
✗
Escalate the issue to senior management and move on
Why it's wrong here
Simply reporting without a mitigation plan is not the best practice.
✗
Remove the web server from service until patches are applied
Why it's wrong here
This may impact business operations unnecessarily when other options exist.
✗
Schedule a rescan to verify if the vulnerabilities still exist
Why it's wrong here
Rescanning does not address the root cause or mitigate the risk.
✓
Implement compensating controls to reduce the risk
Why this is correct
Compensating controls mitigate the risk when patching is not possible.
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
Cisco often tests the misconception that rescanning (Option C) is the correct next step, but the trap here is that rescanning does not change the risk posture—it only confirms what is already known, while the question requires a risk-reducing action.
Detailed technical explanation
How to think about this question
Compensating controls for unpatched web server vulnerabilities often include deploying a Web Application Firewall (WAF) with custom rules to block exploit payloads (e.g., SQL injection patterns or path traversal sequences), or using network-based intrusion prevention systems (IPS) with signatures for the specific CVEs. In a real-world scenario, if a critical Apache Struts vulnerability (e.g., CVE-2017-5638) cannot be patched due to a legacy plugin dependency, a WAF rule that blocks requests containing 'Content-Type: multipart/form-data' with specific OGNL expressions can effectively prevent exploitation. The key is that compensating controls must be documented, tested, and periodically reviewed to ensure they remain effective.
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 compensating controls to reduce the risk — Option D is correct because when a known vulnerability cannot be patched due to application compatibility issues, the standard risk management approach is to implement compensating controls. These controls (e.g., Web Application Firewall rules, network segmentation, or host-based IPS) reduce the likelihood or impact of exploitation without modifying the vulnerable application. This aligns with the NIST SP 800-40 Rev. 4 guidance on vulnerability handling, which explicitly recommends compensating controls when patching is not feasible.
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.
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Question Discussion
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