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 the output of a vulnerability scan and notices that a critical vulnerability on a Linux server has been reported as 'Confirmed' by the scanner. The analyst checks the system and finds that the actual vulnerability does not exist because a kernel upgrade was applied via a yum update but the scanner did not detect the change. Which of the following is the MOST likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The scanner was not configured with proper credentials for authenticated scanning
Option C is correct because the vulnerability scanner reported a 'Confirmed' critical vulnerability that no longer exists after a kernel upgrade via yum. This indicates the scanner performed an unauthenticated scan, relying on banner grabbing or service version detection, which cannot verify the actual installed kernel version. With proper credentials (e.g., SSH keys or a service account), the scanner would have performed an authenticated scan, queried the package manager (rpm -q kernel), and correctly identified that the kernel was updated, thus not flagging the vulnerability.
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.
✗
The vulnerability database was not updated before the scan
Why it's wrong here
An outdated database might miss new CVEs, but this scenario is about a false positive.
✗
The scanner is configured to alert on missing patches only
Why it's wrong here
The scanner reported 'Confirmed' which indicates it believes the vulnerability exists.
✓
The scanner was not configured with proper credentials for authenticated scanning
Why this is correct
Without credentials, the scanner may detect outdated service banners even if patched.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The scanner's plugins for Linux are outdated
Why it's wrong here
Outdated plugins could cause false positives but the core issue is likely authentication.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the distinction between authenticated and unauthenticated scanning, and the trap here is that candidates assume a 'Confirmed' status means the scanner has verified the vulnerability through deep inspection, when in fact it may only indicate that the scanner's unauthenticated checks matched a signature, not that it has actual system-level access to confirm the patch state.
Trap categories for this question
Scenario analysis trap
An outdated database might miss new CVEs, but this scenario is about a false positive.
Detailed technical explanation
How to think about this question
Authenticated scanning uses credentials (e.g., SSH with a dedicated service account) to execute commands like 'rpm -qa --last' or 'uname -r' to retrieve the exact kernel version from the package manager. Without authentication, the scanner relies on network-based fingerprinting (e.g., TCP banner grabbing on SSH port 22), which may show the original kernel version if the service was not restarted after the update. In real-world scenarios, a kernel upgrade via yum requires a reboot to take effect; if the server was not rebooted, the running kernel remains the old version, and the scanner's 'Confirmed' status would be accurate—but here the analyst confirmed the vulnerability does not exist, implying the reboot occurred or the scanner misidentified the version.
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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
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: The scanner was not configured with proper credentials for authenticated scanning — Option C is correct because the vulnerability scanner reported a 'Confirmed' critical vulnerability that no longer exists after a kernel upgrade via yum. This indicates the scanner performed an unauthenticated scan, relying on banner grabbing or service version detection, which cannot verify the actual installed kernel version. With proper credentials (e.g., SSH keys or a service account), the scanner would have performed an authenticated scan, queried the package manager (rpm -q kernel), and correctly identified that the kernel was updated, thus not flagging the vulnerability.
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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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