The correct answer is to implement a workaround to mitigate the vulnerability. This is because a workaround—such as deploying a web application firewall rule, disabling a vulnerable feature, or applying a configuration change—directly reduces the immediate risk of exploitation without requiring a vendor patch, which may take weeks or months to develop. On the CISM exam, this scenario tests your understanding of the incident response phase after containment, specifically the balance between risk reduction and business continuity. A common trap is to recommend developing an in-house patch, but that introduces code complexity and potential new vulnerabilities; instead, the exam emphasizes temporary controls as the immediate action after unknown vulnerability exploitation. Another trap is to suggest disabling the service entirely, which is too disruptive unless no workaround exists. Memory tip: think “WAF before WAIT”—a workaround buys time for the vendor patch.
CISM Incident Management Practice Question
This CISM practice question tests your understanding of incident 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. 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.
After successfully containing an incident, the incident response team discovers that the attacker exploited a previously unknown vulnerability in a web application. The vulnerability is not yet patched by the vendor. The organization's management is concerned about the risk of another attack using the same vulnerability. What should the team recommend as the immediate action to reduce this risk?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement a workaround to mitigate the vulnerability
Implementing a workaround (such as a web application firewall rule or configuration change) reduces the immediate risk while waiting for a vendor patch. Developing a patch in-house is not advisable due to complexity and risk. Reporting to vendor is important but does not provide immediate protection. Disabling the service may be too disruptive.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Implement a workaround to mitigate the vulnerability
Why this is correct
Workarounds can reduce risk quickly without waiting for a patch.
Related concept
Static NAT maps one inside address to one outside address.
✗
Disable the web application until a patch is available
Why it's wrong here
Disabling the service may be too drastic and affect business operations; a workaround is preferred.
✗
Report the vulnerability to the software vendor
Why it's wrong here
Reporting is necessary but does not immediately protect against exploitation.
✗
Develop an in-house patch for the vulnerability
Why it's wrong here
In-house patching is risky and could introduce additional issues; vendors should handle patches.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CISM NAT questions on configuration and troubleshooting.
Incident Management — This question tests Incident Management — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Implement a workaround to mitigate the vulnerability — Implementing a workaround (such as a web application firewall rule or configuration change) reduces the immediate risk while waiting for a vendor patch. Developing a patch in-house is not advisable due to complexity and risk. Reporting to vendor is important but does not provide immediate protection. Disabling the service may be too disruptive.
What should I do if I get this CISM question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CISM NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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