The answer is patch coverage percentage, mean time to remediate (MTTR), and number of vulnerabilities per scan. These three metrics are commonly used for measuring the effectiveness of a vulnerability management program because they directly quantify different aspects of the remediation lifecycle: patch coverage tracks the proportion of systems that have received required patches, MTTR measures the speed of response to identified vulnerabilities, and vulnerabilities per scan provides a baseline for assessing the overall security posture over time. On the CISSP exam, this question tests your understanding of operational metrics within the Security Operations domain, often appearing as a straightforward selection from a list that includes distractors like “number of security incidents” or “cost per patch.” A common trap is confusing vulnerability management metrics with broader risk management KPIs, so remember that these three focus specifically on remediation completeness, speed, and volume. A useful memory tip is “Cover, Time, Count” — think of covering patches, timing fixes, and counting findings.
CISSP Security Assessment and Testing Practice Question
This CISSP practice question tests your understanding of security assessment and testing. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which THREE of the following are commonly used metrics for measuring the effectiveness of a vulnerability management program?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Patch coverage percentage
Patch coverage percentage is a direct measure of vulnerability management effectiveness because it tracks the proportion of systems that have received required patches. A high patch coverage percentage indicates that the organization is successfully applying fixes to known vulnerabilities, reducing the attack surface. This metric is commonly used in vulnerability management programs to assess the completeness of remediation efforts.
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.
✓
Patch coverage percentage
Why this is correct
Coverage measures the extent of systems patched.
Related concept
Read the scenario before looking for a memorised answer.
✗
Mean time to detect (MTTD)
Why it's wrong here
MTTD measures detection speed, not remediation effectiveness.
✓
Mean time to remediate (MTTR)
Why this is correct
MTTR indicates how quickly vulnerabilities are fixed.
Related concept
Read the scenario before looking for a memorised answer.
✓
Number of vulnerabilities per scan
Why this is correct
Tracking volume over time shows progress in reducing vulnerabilities.
Related concept
Read the scenario before looking for a memorised answer.
✗
Number of security incidents
Why it's wrong here
Incident count is an overall security metric, not specific to vulnerability management.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Mean Time to Detect (MTTD) and Mean Time to Remediate (MTTR) as both being relevant to vulnerability management, but MTTD is specific to incident response, not to the proactive patching and remediation cycle measured by MTTR and patch coverage.
Detailed technical explanation
How to think about this question
Patch coverage percentage is calculated by dividing the number of systems that have received a specific patch by the total number of systems that require that patch, often tracked via asset management databases and patch management tools like SCCM or WSUS. In real-world scenarios, a high patch coverage percentage can be misleading if not combined with vulnerability severity scoring (e.g., CVSS) and remediation timelines, as critical vulnerabilities may remain unpatched on high-value assets. This metric is part of a balanced scorecard approach, where it is paired with Mean Time to Remediate (MTTR) to provide a complete picture of remediation efficiency.
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 CISSP question in full detail.
Security Assessment and Testing — This question tests Security Assessment and Testing — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Patch coverage percentage — Patch coverage percentage is a direct measure of vulnerability management effectiveness because it tracks the proportion of systems that have received required patches. A high patch coverage percentage indicates that the organization is successfully applying fixes to known vulnerabilities, reducing the attack surface. This metric is commonly used in vulnerability management programs to assess the completeness of remediation efforts.
What should I do if I get this CISSP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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