Patching the specific vulnerability identified is the most critical action during the eradication phase because it permanently removes the root cause of the breach, directly addressing the CISO’s goal to prevent recurrence. Without this step, the same attack vector—such as an unpatched SQL injection flaw or a known CVE in a web server—remains exploitable, rendering containment efforts temporary and leaving the organization exposed. On the CISM exam, this question tests your understanding that eradication is about eliminating the technical weakness, not just mitigating symptoms; a common trap is choosing “implementing additional monitoring” or “updating the incident response plan,” which are post-eradication improvements, not the immediate fix. Remember the memory tip: “Patch the path, not the pain”—the vulnerability is the path an attacker used, and patching it closes that door for good.
CISM Incident Management Practice Question
This CISM practice question tests your understanding of incident management. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A large enterprise experiences a data breach involving personal identifiable information (PII) of customers. The incident response team has contained the breach and is now in the eradication phase. The CISO wants to ensure that the same vulnerability cannot be exploited again. Which action is MOST critical?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Patch the specific vulnerability identified.
Patching the specific vulnerability is the most critical action during the eradication phase because it permanently removes the root cause of the breach. Without this step, the same attack vector (e.g., an unpatched SQL injection flaw or a known CVE in a web server) remains exploitable, rendering containment efforts temporary. The CISO's goal to prevent recurrence directly requires eliminating the technical weakness, not just mitigating its symptoms.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Change all passwords of affected accounts.
Why it's wrong here
Password changes are important but do not fix the vulnerability.
✗
Notify affected customers about the breach.
Why it's wrong here
Notification is a legal requirement but does not prevent future incidents.
✗
Deploy additional endpoint protection software.
Why it's wrong here
Additional software may help but does not address the specific root cause.
✓
Patch the specific vulnerability identified.
Why this is correct
Patching the vulnerability directly prevents re-exploitation.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISACA often tests the distinction between containment actions (like password resets) and eradication actions (like patching), tricking candidates into choosing a visible, immediate step over the root-cause fix.
Detailed technical explanation
How to think about this question
In the eradication phase, the incident response team must apply the exact vendor-supplied patch or a compensating control (e.g., a WAF rule for a zero-day) to close the specific CVE or misconfiguration. For example, if the breach exploited an unpatched Apache Log4j vulnerability (CVE-2021-44228), simply adding endpoint detection software would not remove the vulnerable library from the application server. The patch must be tested and deployed across all affected systems, including those not directly involved in the breach, to ensure complete remediation.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Incident Management — This question tests Incident Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Patch the specific vulnerability identified. — Patching the specific vulnerability is the most critical action during the eradication phase because it permanently removes the root cause of the breach. Without this step, the same attack vector (e.g., an unpatched SQL injection flaw or a known CVE in a web server) remains exploitable, rendering containment efforts temporary. The CISO's goal to prevent recurrence directly requires eliminating the technical weakness, not just mitigating its symptoms.
What should I do if I get this CISM question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This CISM practice question is part of Courseiva's free ISACA 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 CISM exam.
Question Discussion
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