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Unpatched Legacy System Risk Treatment for CASP+
During a risk assessment, the analyst identifies that a legacy system containing sensitive data cannot be patched due to vendor end-of-life. The system is critical to operations. Which risk treatment strategy is MOST appropriate?
⚠ Common exam trap
CompTIA often tests the misconception that 'acceptance' is the default for legacy systems, but the trap here is that acceptance without compensating controls is only appropriate when the risk is formally accepted by management and the system does not contain sensitive data; for sensitive data, compensating controls are required to reduce risk to an acceptable level.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Mitigation by implementing compensating controls
When a legacy system cannot be patched due to vendor end-of-life, the most appropriate risk treatment is to implement compensating controls (e.g., network segmentation, strict access controls, host-based intrusion detection) to reduce the likelihood or impact of exploitation. This allows the organization to continue critical operations while managing the residual risk, as avoidance or transfer would be impractical or insufficient.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Transfer by purchasing cyber insurance
Why it's wrong here
Cyber insurance compensates financial loss after an incident but leaves the unpatched legacy system exploitable, so the sensitive data remains exposed. Transfer suits low-likelihood, high-impact risks where residual loss is acceptable; here the critical operational system demands a control that reduces exposure, not just financial cover.
- ✗
Avoidance by decommissioning the system
Why it's wrong here
Decommissioning removes the vulnerability but also removes a system the stem states is critical to operations, so the business impact outweighs the security gain. Avoidance suits non-essential systems whose loss is tolerable; here the operational dependency means the risk must be treated while the system continues running.
- ✗
Acceptance by documenting the risk
Why it's wrong here
Acceptance documents the risk but leaves the critical system unpatched and exploitable, which is unjustifiable for sensitive data supporting essential operations. Acceptance is appropriate for low-impact risks within tolerance; this scenario requires an active treatment that reduces the exposure rather than merely recording it.
- ✓
Mitigation by implementing compensating controls
Why this is correct
Compensating controls reduce risk without patching, satisfying the end-of-life constraint. Because the vendor no longer supplies fixes, mitigation through network segmentation, strict access control or virtual patching limits exploitability while the critical system continues operating.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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