Quick Answer
The correct answer is to track the vulnerability until the underlying flaw is fixed. A Web Application Firewall (WAF) rule that blocks known exploit payloads provides only a temporary, signature-based defense, not a permanent fix, because attackers can bypass such rules using techniques like encoding, parameter pollution, or alternate HTTP methods. On the CompTIA CySA+ CS0-003 exam, this scenario tests your understanding of defense-in-depth and the distinction between mitigation and remediation—a common trap is assuming a high CVSS vulnerability is resolved once a WAF blocks current exploits. Remember that a WAF is a compensating control, not a cure; the core flaw remains exploitable if the attacker finds a bypass. A useful memory tip is "WAF is a bandage, not a surgery"—always prioritize fixing the code over relying on detection rules.
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. 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.
An application has a high CVSS vulnerability, but a WAF rule blocks known exploit payloads. What should the team still do? (Choose two.)
Validate the WAF rule against bypass and false-positive risk
Compensating controls need effectiveness testing.
Remove the application from vulnerability scans
Why wrong: Removing it hides future risk.
Mark the vulnerability as permanently remediated
Why wrong: The underlying flaw remains.
Track the vulnerability until the underlying flaw is fixed
A WAF is a compensating control, not a permanent fix.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Validate the WAF rule against bypass and false-positive risk
A WAF rule blocking known exploit payloads does not guarantee complete protection, as attackers can craft bypass techniques such as encoding, parameter pollution, or using different HTTP methods. Validating the rule against bypass and false-positive risks ensures the WAF is effective without disrupting legitimate traffic, which is critical for maintaining both security and availability.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Validate the WAF rule against bypass and false-positive risk
Why this is correct
Compensating controls need effectiveness testing.
Related concept
Read the scenario before looking for a memorised answer.
Remove the application from vulnerability scans
Why it's wrong here
Removing it hides future risk.
Mark the vulnerability as permanently remediated
Why it's wrong here
The underlying flaw remains.
Track the vulnerability until the underlying flaw is fixed
Why this is correct
A WAF is a compensating control, not a permanent fix.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Cisco often tests the misconception that a compensating control like a WAF rule is equivalent to a permanent fix, leading candidates to incorrectly mark the vulnerability as remediated without addressing the root cause in the application code.
Detailed technical explanation
WAFs operate by inspecting HTTP/HTTPS traffic against signature-based or behavioral rules, but they can be evaded through techniques like case variation, URL encoding, or using HTTP/2 multiplexing to split payloads. In a real-world scenario, a SQL injection payload blocked by a WAF might be bypassed by using a different encoding scheme (e.g., double URL encoding) or by exploiting a WAF's failure to inspect multipart form data, underscoring the need for continuous validation and tuning.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 — Read the scenario before looking for a memorised answer..
The correct answer is: Validate the WAF rule against bypass and false-positive risk — A WAF rule blocking known exploit payloads does not guarantee complete protection, as attackers can craft bypass techniques such as encoding, parameter pollution, or using different HTTP methods. Validating the rule against bypass and false-positive risks ensures the WAF is effective without disrupting legitimate traffic, which is critical for maintaining both security and availability.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This CS0-003 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CS0-003 exam.
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