The answer is to patch or mitigate the internet-facing VPN appliance immediately. This is correct because a critical vulnerability that is unauthenticated, remotely exploitable, and actively exploited in the wild presents the highest possible risk to an organization; an attacker can compromise the device without any credentials and use it as a beachhead to move laterally into the internal network. On the CompTIA CySA+ CS0-003 exam, this scenario tests your ability to apply risk-based vulnerability management principles, where you must prioritize vulnerabilities based on exploitability, exposure, and business impact rather than just CVSS score alone. A common trap is to focus on the sheer number of internal medium findings, but the exam emphasizes that a single critical internet-facing flaw with active exploitation trumps all lower-severity internal issues. Remember the mnemonic "ICE" for prioritization: Internet-facing, Critical severity, and Exploited in the wild—if any vulnerability hits all three, it is the immediate remediation priority.
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: prioritize vulnerabilities by severity, 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 business prioritization, Which recommendation gives the best risk-based order of work?
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 with a critical unauthenticated remote-code-execution flaw that is actively exploited in the wild represents an immediate and severe risk to the organization's security posture. An internet-facing device with such a vulnerability can be compromised by any attacker on the internet without authentication, leading to full system compromise and potential lateral movement into the internal network. Prioritizing remediation of this flaw over internal-only medium vulnerabilities aligns with risk-based vulnerability management principles, as the likelihood and impact of exploitation are far higher.
Key principle: Prioritize vulnerabilities by severity, 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.
✓
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
Prioritize vulnerabilities by severity, exploitability, and exposure.
✗
Defer all remediation until the monthly patch window
Why it's wrong here
Known exploited internet-facing RCE requires emergency handling.
✗
Start with the oldest medium vulnerability
Why it's wrong here
Age matters, but exploitability and exposure drive priority.
✗
Remediate only low-risk internal findings to improve closure rate
Why it's wrong here
Closure rate alone can create misleading risk reduction.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that all vulnerabilities should be patched in order of severity score or age, rather than considering the business context of internet exposure and active exploitation, leading candidates to choose a technically correct but risk-ignorant option like 'start with the oldest medium vulnerability'.
Detailed technical explanation
How to think about this question
Unauthenticated remote code execution on a VPN appliance typically involves exploitation of a buffer overflow, command injection, or deserialization flaw in the VPN's SSL/TLS or IPsec handling code, often triggered by a crafted packet or HTTP request. In real-world scenarios, such vulnerabilities (e.g., CVE-2023-20269 in Cisco ASA/FTD or CVE-2021-22893 in Pulse Secure) are weaponized within hours of disclosure, with ransomware groups using them for initial access. The CVSS score for such flaws is usually 9.0-10.0, and the presence of active exploitation in the wild (as indicated by CISA's Known Exploited Vulnerabilities catalog) mandates immediate action per binding operational directives.
KKey Concepts to Remember
Prioritize vulnerabilities by severity, exploitability, and exposure.
Remote Code Execution (RCE) is among the highest severity vulnerability types.
Risk-based prioritization often overrides standard patch schedules for critical threats.
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
Prioritize vulnerabilities by severity, 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 prioritize vulnerabilities by severity, exploitability, and exposure., then practise related CS0-003 questions on the same topic to reinforce the concept.
Vulnerability Management — This question tests Vulnerability Management — Prioritize vulnerabilities by severity, 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 — The VPN appliance with a critical unauthenticated remote-code-execution flaw that is actively exploited in the wild represents an immediate and severe risk to the organization's security posture. An internet-facing device with such a vulnerability can be compromised by any attacker on the internet without authentication, leading to full system compromise and potential lateral movement into the internal network. Prioritizing remediation of this flaw over internal-only medium vulnerabilities aligns with risk-based vulnerability management principles, as the likelihood and impact of exploitation are far higher.
What should I do if I get this CS0-003 question wrong?
Review prioritize vulnerabilities by severity, 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: "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?
Prioritize vulnerabilities by severity, exploitability, and exposure.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. 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 stakeholder management, Which documentation or approval is required to keep the programme defensible?
easy
✓ A.Patch or mitigate the VPN appliance immediately and verify exposure is removed
B.Start with the oldest medium vulnerability
C.Remediate only low-risk internal findings to improve closure rate
D.Defer all remediation until the monthly patch window
Why A: The critical unauthenticated remote-code-execution vulnerability on an internet-facing VPN appliance is actively exploited in the wild, posing an immediate risk of complete compromise. Remediation must be prioritized based on severity, exploitability, and exposure, making immediate patching or mitigation the only defensible first step.
Variation 2. 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?
easy
✓ A.Patch or mitigate the VPN appliance immediately and verify exposure is removed
B.Remediate only low-risk internal findings to improve closure rate
C.Start with the oldest medium vulnerability
D.Defer all remediation until the monthly patch window
Why A: 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.
Variation 3. 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 validation, Which action should be taken before closing or downgrading the finding?
easy
✓ A.Patch or mitigate the VPN appliance immediately and verify exposure is removed
B.Start with the oldest medium vulnerability
C.Remediate only low-risk internal findings to improve closure rate
D.Defer all remediation until the monthly patch window
Why A: The critical unauthenticated remote-code-execution (RCE) vulnerability on the internet-facing VPN appliance poses an immediate and active threat, as it is being exploited in the wild. According to the CVSS scoring system and industry best practices (e.g., PCI DSS, NIST SP 800-115), vulnerabilities that are remotely exploitable, have high impact, and are actively exploited must be prioritized over internal-only medium-severity issues. Remediating this flaw first reduces the attack surface exposed to the internet and prevents potential compromise of the entire network.
Last reviewed: Jun 11, 2026
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