This CS0-003 practice question tests your understanding of vulnerability management. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: vulnerability closure requires objective validation.. 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 team says a critical vulnerability was patched. What should the vulnerability manager require before closure? For validation, Which action should be taken before closing or downgrading the finding?
Create a duplicate ticket for every asset
Why wrong: Duplicates create noise and do not prove remediation.
A retest showing the vulnerable condition is no longer present
Closure should be based on validation evidence, not only a remediation claim.
Close it immediately based on the email
Why wrong: Claims need verification.
Wait one year before testing
Why wrong: Delayed validation leaves uncertainty.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
A retest showing the vulnerable condition is no longer present
Option B is correct because the vulnerability manager must obtain objective evidence that the fix was successfully applied and the vulnerability is no longer exploitable. A retest—typically performed via authenticated scanning or manual verification—confirms the absence of the vulnerable condition, aligning with the remediation validation phase in the vulnerability management lifecycle. Closing based solely on a team's email (Option C) violates the principle of verify, not trust, and could leave residual risk unaddressed.
Key principle: Vulnerability closure requires objective validation.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Create a duplicate ticket for every asset
Why it's wrong here
Duplicates create noise and do not prove remediation.
A retest showing the vulnerable condition is no longer present
Why this is correct
Closure should be based on validation evidence, not only a remediation claim.
Related concept
Vulnerability closure requires objective validation.
Close it immediately based on the email
Why it's wrong here
Claims need verification.
Wait one year before testing
Why it's wrong here
Delayed validation leaves uncertainty.
Common exam traps
Cisco often tests the principle that vulnerability closure requires independent verification (retest) rather than accepting a team's assertion, and the trap here is that candidates may think an email confirmation is sufficient because it comes from the responsible team, ignoring the need for objective evidence.
Detailed technical explanation
In practice, a retest often involves running an authenticated vulnerability scan against the patched asset using the same plugin or check that originally detected the vulnerability, ensuring the plugin returns a 'not vulnerable' result. For network-level vulnerabilities, this may include verifying that the affected service version has been updated (e.g., checking OpenSSL version after a Heartbleed patch) or that a specific configuration change (e.g., disabling TLS 1.0) is in effect. The CVSS scoring framework and many compliance standards (e.g., PCI DSS Requirement 6.2) explicitly require evidence of remediation before closure, not just a verbal or email confirmation.
Key takeaway
Vulnerability closure requires objective validation.
Real-world example
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.
What to study next
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FAQ
Vulnerability Management — This question tests Vulnerability Management — Vulnerability closure requires objective validation..
The correct answer is: A retest showing the vulnerable condition is no longer present — Option B is correct because the vulnerability manager must obtain objective evidence that the fix was successfully applied and the vulnerability is no longer exploitable. A retest—typically performed via authenticated scanning or manual verification—confirms the absence of the vulnerable condition, aligning with the remediation validation phase in the vulnerability management lifecycle. Closing based solely on a team's email (Option C) violates the principle of verify, not trust, and could leave residual risk unaddressed.
Review vulnerability closure requires objective validation., then practise related CS0-003 questions on the same topic to reinforce the concept.
Vulnerability closure requires objective validation.
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Last reviewed: Jun 11, 2026
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