The answer is to patch or mitigate the internet-facing VPN appliance immediately. This is correct because a critical unauthenticated remote-code-execution (RCE) vulnerability that is actively exploited in the wild represents the highest possible risk, as it allows an attacker to compromise the network perimeter without any credentials. The CVSS scoring system typically rates such flaws at 9.0–10.0, and risk-based prioritization demands that externally exploitable, actively weaponized vulnerabilities be remediated before any internal-only medium issues. On the CompTIA CySA+ CS0-003 exam, this scenario tests your understanding of vulnerability prioritization and the principle that internet-facing RCE flaws always take precedence over internal findings, regardless of count. A common trap is to spread resources across all vulnerabilities equally, but the correct approach is to eliminate the critical perimeter threat first. For tool configuration, integrating threat intelligence feeds into your scanner or pipeline most directly improves result quality by correlating CVSS scores with active exploitation data. Memory tip: “Outside first, inside last—patch the perimeter before you patch the past.”
CS0-003 Vulnerability Management Practice Question
This CS0-003 practice question tests your understanding of vulnerability management. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. A key principle to apply: vulnerability prioritization considers impact, exploitability, and 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 tool configuration, Which scanner or pipeline change most directly improves result quality?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
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
Option B is correct because the vulnerability is a critical unauthenticated remote-code-execution (RCE) flaw on an internet-facing VPN appliance that is actively exploited in the wild. According to the CVSS scoring system, such a flaw (typically CVSS 9.0–10.0) poses an immediate and severe risk to the organization's perimeter, and remediation must be prioritized over all internal-only medium vulnerabilities. The principle of risk-based prioritization dictates that externally exploitable, actively weaponized vulnerabilities must be patched or mitigated first to prevent a likely breach.
Key principle: Vulnerability prioritization considers impact, exploitability, and 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.
✗
Remediate only low-risk internal findings to improve closure rate
Why it's wrong here
Closure rate alone can create misleading risk reduction.
✓
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 word "first" in the question point toward this answer.
Related concept
Vulnerability prioritization considers impact, exploitability, and exposure.
✗
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
The trap here is that candidates may mistakenly prioritize remediation by age or internal-only status, failing to recognize that a critical, actively exploited, internet-facing RCE flaw demands immediate action over any medium or low-risk internal findings, regardless of their age or quantity.
Detailed technical explanation
How to think about this question
Under the hood, unauthenticated RCE on a VPN appliance often involves memory corruption (e.g., buffer overflow) or command injection in the VPN's SSL/TLS or IKE handling, allowing an attacker to execute arbitrary code with system privileges. In a real-world scenario, such as the CVE-2023-20269 flaw in Cisco ASA/FTD, attackers leveraged this to deploy ransomware, demonstrating that even a single unpatched internet-facing device can lead to a full network compromise. The CVSS v3.1 vector for such a flaw typically includes AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, confirming the highest possible impact and exploitability.
KKey Concepts to Remember
Vulnerability prioritization considers impact, exploitability, and exposure.
Internet-facing systems with critical flaws are top priority.
Remote Code Execution (RCE) is a high-impact vulnerability.
Verification of remediation effectiveness is a critical step.
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
Vulnerability prioritization considers impact, exploitability, and 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 vulnerability prioritization considers impact, exploitability, and exposure., then practise related CS0-003 questions on the same topic to reinforce the concept.
Vulnerability Management — This question tests Vulnerability Management — Vulnerability prioritization considers impact, exploitability, and 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 — Option B is correct because the vulnerability is a critical unauthenticated remote-code-execution (RCE) flaw on an internet-facing VPN appliance that is actively exploited in the wild. According to the CVSS scoring system, such a flaw (typically CVSS 9.0–10.0) poses an immediate and severe risk to the organization's perimeter, and remediation must be prioritized over all internal-only medium vulnerabilities. The principle of risk-based prioritization dictates that externally exploitable, actively weaponized vulnerabilities must be patched or mitigated first to prevent a likely breach.
What should I do if I get this CS0-003 question wrong?
Review vulnerability prioritization considers impact, exploitability, and 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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Vulnerability prioritization considers impact, exploitability, and exposure.
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