CS0-003 Vulnerability Management Practice Question
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: internet-facing assets carry higher inherent risk due to external exposure.. 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 vulnerability scan identifies a critical unauthenticated remote-code-execution flaw on an internet-facing VPN appliance that is actively exploited in the wild. Several internal-only medium vulnerabilities are also present. What should be remediated first? For control selection, Which control best addresses the stated weakness without hiding risk?
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.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Patch or mitigate the VPN appliance immediately and verify exposure is removed
The VPN appliance's critical unauthenticated remote-code-execution flaw is actively exploited in the wild, posing an immediate and severe risk to the entire network perimeter. Remediating this first aligns with the vulnerability management principle of prioritizing by risk severity and exploitability, as an internet-facing device with a known active exploit bypasses all authentication controls and can lead to full compromise. Patching or mitigating it directly removes the exposure without obscuring the risk, unlike compensating controls that might hide the underlying weakness.
Key principle: Internet-facing assets carry higher inherent risk due to external exposure.
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 or mitigate the VPN appliance immediately and verify exposure is removed
Why this is correct
Internet exposure plus active exploitation makes this the highest-risk item despite other findings.
Clue confirmation
The clue words "best", "first" in the question point toward this answer.
Related concept
Internet-facing assets carry higher inherent risk due to external exposure.
✗
Remediate only low-risk internal findings to improve closure rate
Why it's wrong here
Closure rate alone can create misleading risk reduction.
✗
Start with the oldest medium vulnerability
Why it's wrong here
Age matters, but exploitability and exposure drive priority.
✗
Defer all remediation until the monthly patch window
Why it's wrong here
Known exploited internet-facing RCE requires emergency handling.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that all vulnerabilities should be remediated in order of CVSS score alone, but here the trap is that candidates might choose a lower-severity internal finding because it is 'older' or 'easier to fix,' ignoring the criticality of an actively exploited, internet-facing RCE that demands immediate action regardless of other metrics.
Detailed technical explanation
How to think about this question
Unauthenticated remote-code-execution on a VPN appliance typically involves flaws in protocols like SSL/TLS handshake handling or VPN tunnel negotiation (e.g., buffer overflows in OpenSSL or custom VPN daemons), allowing an attacker to execute arbitrary code without credentials. Active exploitation in the wild means threat actors have weaponized the exploit, often via public proof-of-concept code, and automated scanners or botnets are actively targeting the vulnerability, as seen in CVEs like CVE-2023-46805 (Ivanti VPN) or CVE-2024-21887. Patching immediately removes the attack vector, whereas mitigations like access control lists (ACLs) may reduce exposure but can be bypassed and do not fix the underlying code flaw, thus hiding residual risk.
KKey Concepts to Remember
Internet-facing assets carry higher inherent risk due to external exposure.
Remote Code Execution (RCE) is a critical vulnerability type allowing arbitrary code execution.
Active exploitation in the wild demands immediate, emergency remediation.
Vulnerability prioritization should be based on risk (impact x likelihood), not just age or quantity.
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
Internet-facing assets carry higher inherent risk due to external exposure.
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.
Review internet-facing assets carry higher inherent risk due to external exposure., then practise related CS0-003 questions on the same topic to reinforce the concept.
Vulnerability Management — This question tests Vulnerability Management — Internet-facing assets carry higher inherent risk due to external exposure..
What is the correct answer to this question?
The correct answer is: Patch or mitigate the VPN appliance immediately and verify exposure is removed — The VPN appliance's critical unauthenticated remote-code-execution flaw is actively exploited in the wild, posing an immediate and severe risk to the entire network perimeter. Remediating this first aligns with the vulnerability management principle of prioritizing by risk severity and exploitability, as an internet-facing device with a known active exploit bypasses all authentication controls and can lead to full compromise. Patching or mitigating it directly removes the exposure without obscuring the risk, unlike compensating controls that might hide the underlying weakness.
What should I do if I get this CS0-003 question wrong?
Review internet-facing assets carry higher inherent risk due to external exposure., then practise related CS0-003 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best", "first". 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?
Internet-facing assets carry higher inherent risk due to external exposure.
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