The correct action is to implement a virtual patch through an intrusion prevention system (IPS). This is the immediate step to address a zero-day vulnerability during an incident because vendor patches are not yet available for previously unknown exploits, and a virtual patch uses IPS signatures to detect and block attack traffic targeting the flaw without altering the underlying software. On the Certified Information Security Manager CISM exam, this scenario tests your understanding of compensating controls in incident response, emphasizing that containment and protection must be prioritized over permanent fixes when a zero-day vulnerability incident response is underway. A common trap is choosing to disable the software entirely, which may be too disruptive for business operations, whereas a virtual patch provides a balanced, short-term safeguard. Remember the mnemonic “VIP” for Virtual IPS Patch—it’s the immediate, non-disruptive shield until a vendor fix arrives.
CISM Incident Management Practice Question
This CISM practice question tests your understanding of incident 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.
During a security incident, the incident response team discovers that an attacker used a previously unknown vulnerability (zero-day) in a widely used software. Which action should the team take to address this vulnerability in the short term?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement a virtual patch through an intrusion prevention system (IPS)
Applying a vendor patch may not be available for zero-day. Implementing a virtual patch via an IPS provides immediate protection until a permanent fix is available. Recompiling the software (B) is not feasible. Reimaging all systems (C) does not address the vulnerability. Disabling the software (D) 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 virtual patch through an intrusion prevention system (IPS)
Why this is correct
Virtual patching blocks exploit attempts while waiting for a permanent fix.
Related concept
Static NAT maps one inside address to one outside address.
✗
Recompile the software with additional security controls
Why it's wrong here
Recompiling is impractical and may not be possible without source code.
✗
Immediately disable the software across the organization
Why it's wrong here
Disabling may severely impact business operations.
✗
Deploy a vendor patch as soon as it becomes available
Why it's wrong here
Vendor patch may take time; this is a long-term solution.
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 virtual patch through an intrusion prevention system (IPS) — Applying a vendor patch may not be available for zero-day. Implementing a virtual patch via an IPS provides immediate protection until a permanent fix is available. Recompiling the software (B) is not feasible. Reimaging all systems (C) does not address the vulnerability. Disabling the software (D) 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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