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CompTIA CS0-003 Practice Test 51

Question 500

A low-priority bug has recurred on each monthly build after a permanent fix was claimed. What is the MOST appropriate analyst action based on the evidence?

  1. Compare coverage, normalized findings per asset and verified resolution trend.
  2. Measure time to validated closure and separately report overdue unverified findings.
  3. Escalate for timely reevaluation or renewed mitigation before expiration.
  4. Investigate root cause in build and configuration pipelines.

Explanation

Correct Answer

D:

Reappearance suggests a systemic process defect rather than independent isolated tickets. Identify recurring vulnerability reintroduction.

Incorrect Answers

A:

Larger detection scope can inflate counts without equivalent deterioration in controls. It could help interpret backlog growth versus scanning expansion, but it would not identify recurring vulnerability reintroduction.

B:

Administrative closure is not equivalent to confirmed risk reduction. That is relevant to vulnerability aging and exceptions, not to identify recurring vulnerability reintroduction.

C:

Exceptions cannot silently become permanent avoidance of accountability. It would enforce expiring vulnerability exception, but it would not identify recurring vulnerability reintroduction.

Question 501

A patch blocks one CVE but changes a trust boundary to allow direct database access. Which next step is MOST defensible for the security team?

  1. Include introduced exposure in post-change risk validation.
  2. Reevaluate previously accepted vulnerabilities for new internet exposure.
  3. Escalate exploitation likelihood and contain the trusted path.
  4. Reassess reachable parsing attack surface before adopting prior risk ratings.

Explanation

Correct Answer

A:

Narrow CVE closure can coexist with newly created architectural weaknesses. Assess security regression after patch.

Incorrect Answers

B:

Deployment location can increase exploit likelihood without software changes. It would reopen risk after moving legacy app to public subnet, but it would not assess security regression after patch.

C:

Compromised allowed identities defeat access assumptions behind prior risk reduction. It could help prioritize partner-only vulnerability after credential breach, but it would not assess security regression after patch.

D:

New functionality changes exploit entry conditions and trust boundaries. That is relevant to threat modeling context during triage, not to assess security regression after patch.

Question 502

A flaw affects an unclassified marketing kiosk with no sensitive access and easy restoration. Which action BEST aligns with sound security operations?

  1. Prioritize confidentiality impact and third-party reach in the remediation queue.
  2. Keep remediation scheduled but distinguish lower business impact from mission-critical assets.
  3. Coordinate urgent mitigations with OT safety owners before intrusive patch attempts.
  4. Elevate integrity impact even if confidentiality impact appears low.

Explanation

Correct Answer

B:

Business significance and recoverability influence remediation urgency. Contextualize low-impact kiosk exposure.

Incorrect Answers

A:

Sensitive PII and vendor access increase breach consequences. It would prioritize HR portal with sensitive PII, but it would not contextualize low-impact kiosk exposure.

C:

Service integrity and availability risks are severe, but unsafe changes can harm operations. That is relevant to business criticality and data types, not to contextualize low-impact kiosk exposure.

D:

Unauthorized financial modification can be as damaging as data theft. It would prioritize transaction integrity risk, but it would not contextualize low-impact kiosk exposure.

Question 503

A service listens only on localhost and is inaccessible to other machines, but a public CVE exists. Which response BEST addresses the security problem described?

  1. Prioritize internal segmentation and credential hardening against lateral movement.
  2. Review the direct origin path and enforce network-layer access control.
  3. Evaluate local attacker prerequisites and planned hardening rather than assuming internet exploitability.
  4. Prioritize the verified reachable exploit chain and record blocked alternatives.

Explanation

Correct Answer

C:

Binding to loopback narrows the remote attack path. Distinguish loopback-only service exposure.

Incorrect Answers

A:

Internal exploitability still matters after phishing footholds. It could help address reachable internal admin vulnerability, but it would not distinguish loopback-only service exposure.

B:

Application-layer filtering cannot protect traffic bypassing the protected path. That is relevant to reachability and lateral movement exposure, not to distinguish loopback-only service exposure.

D:

Attack-path feasibility requires real connectivity evidence. It could help validate reachable attack chain, but it would not distinguish loopback-only service exposure.

Question 504

A zero-day disclosure occurs during an outage with the affected service isolated from users. Which investigative or response action BEST fits the evidence?

  1. Track the vendor identifier and affected build rather than waiting for CVE assignment.
  2. Reopen the risk assessment and revise compensating controls immediately.
  3. Coordinate forensic capture and response priorities before modifying the compromised system.
  4. Validate isolation and plan controlled permanent remediation after service stability.

Explanation

Correct Answer

D:

Temporary isolation can buy time without ignoring the vulnerability. Manage zero-day during critical outage.

Incorrect Answers

A:

CVE numbering is not a prerequisite for risk treatment. That is relevant to exploit lifecycle and zero-day, not to manage zero-day during critical outage.

B:

New exploit capability changes residual risk even without a new CVE. It would reassess controls after mitigation bypass, but it would not manage zero-day during critical outage.

C:

Unplanned patching can destroy incident evidence or disrupt containment. It could help align urgent patch with evidence collection, but it would not manage zero-day during critical outage.

Question 505

A critical exception expires today but the owner has not reviewed compensating controls. What is the MOST appropriate analyst action based on the evidence?

  1. Escalate for timely reevaluation or renewed mitigation before expiration.
  2. Investigate root cause in build and configuration pipelines.
  3. Compare coverage, normalized findings per asset and verified resolution trend.
  4. Measure time to validated closure and separately report overdue unverified findings.

Explanation

Correct Answer

A:

Exceptions cannot silently become permanent avoidance of accountability. Enforce expiring vulnerability exception.

Incorrect Answers

B:

Reappearance suggests a systemic process defect rather than independent isolated tickets. It could help identify recurring vulnerability reintroduction, but it would not enforce expiring vulnerability exception.

C:

Larger detection scope can inflate counts without equivalent deterioration in controls. That is relevant to vulnerability aging and exceptions, not to enforce expiring vulnerability exception.

D:

Administrative closure is not equivalent to confirmed risk reduction. It would measure verified vulnerability remediation time, but it would not enforce expiring vulnerability exception.

Question 506

An isolated lab server receives a low risk rank although it can reach production secrets through shared storage. Which next step is MOST defensible for the security team?

  1. Reassess the exception and obtain renewed risk-owner decision.
  2. Include actual dependency and privilege paths when assessing exposure.
  3. Examine the attack vector evidence and correct the score inputs.
  4. Add business impact and likelihood context when discussing enterprise risk.

Explanation

Correct Answer

B:

Network labels alone do not capture all trust relationships. Uncover hidden production risk through shared storage.

Incorrect Answers

A:

Risk acceptance must be revisited when likelihood changes materially. It could help reopen risk acceptance after exploit changes, but it would not uncover hidden production risk through shared storage.

C:

Access requirements are fundamental to technical severity. It would validate attack vector rating accuracy, but it would not uncover hidden production risk through shared storage.

D:

Technical severity scores are not direct monetary loss estimates. It could help separate CVSS from financial risk calculation, but it would not uncover hidden production risk through shared storage.

Question 507

A scan finds 2,000 identical CVEs on transient desktop test machines and one on a public identity provider. Which action BEST aligns with sound security operations?

  1. Remove access or isolate immediately rather than waiting solely for retirement.
  2. Use approved temporary containment and a documented change plan with immediate post-window remediation.
  3. Prioritize the exposed identity provider based on attack path and business service.
  4. Contain affected scope and accelerate enterprise remediation beyond routine maintenance.

Explanation

Correct Answer

C:

Raw finding counts should not eclipse high-consequence single assets. Prioritize high-value identity service over CVE count.

Incorrect Answers

A:

Planned disposal does not eliminate current attack exposure. That is relevant to remediation sequencing in large estates, not to prioritize high-value identity service over CVE count.

B:

Risk treatment may require sequencing around noninterruptible business activity. It would schedule critical fix with safe interim control, but it would not prioritize high-value identity service over CVE count.

D:

Demonstrated exploitation materially raises broader fleet likelihood. That is relevant to remediation sequencing in large estates, not to prioritize high-value identity service over CVE count.

Question 508

A vulnerability is already exploited in one workstation subnet while other hosts await patching. Which response BEST addresses the security problem described?

  1. Prioritize the exposed identity provider based on attack path and business service.
  2. Remove access or isolate immediately rather than waiting solely for retirement.
  3. Use approved temporary containment and a documented change plan with immediate post-window remediation.
  4. Contain affected scope and accelerate enterprise remediation beyond routine maintenance.

Explanation

Correct Answer

D:

Demonstrated exploitation materially raises broader fleet likelihood. Respond to observed exploited vulnerability across fleet.

Incorrect Answers

A:

Raw finding counts should not eclipse high-consequence single assets. It would prioritize high-value identity service over CVE count, but it would not respond to observed exploited vulnerability across fleet.

B:

Planned disposal does not eliminate current attack exposure. It could help mitigate vulnerable service awaiting decommission, but it would not respond to observed exploited vulnerability across fleet.

C:

Risk treatment may require sequencing around noninterruptible business activity. That is relevant to remediation sequencing in large estates, not to respond to observed exploited vulnerability across fleet.

Question 509

A vulnerability requires local user interaction before exploitation on an unattended server. Which investigative or response action BEST fits the evidence?

  1. Reassess realistic entry path while preserving evidence of other potential access vectors.
  2. Increase remediation urgency based on external reach and business criticality.
  3. Adjust deployment priority for isolation while retaining the high technical severity.
  4. Assess actual dataset sensitivity before assigning data-loss business impact.

Explanation

Correct Answer

A:

Required user interaction may reduce likelihood for some headless deployments. Interpret user-interaction exploit prerequisite.

Incorrect Answers

B:

A lower base score may still threaten an essential exposed service. That is relevant to cvss vector versus deployment context, not to interpret user-interaction exploit prerequisite.

C:

CVSS base severity is not a complete measure of environmental exposure. It would prioritize isolated high-CVSS vulnerability, but it would not interpret user-interaction exploit prerequisite.

D:

Impact must reflect information present in the affected asset. It could help contextualize confidentiality impact to actual data, but it would not interpret user-interaction exploit prerequisite.

Question 510

A zero-day is reported on a critical service and no vendor patch exists. What is the MOST appropriate analyst action based on the evidence?

  1. Escalate remediation and containment because weaponization and reachability increased.
  2. Apply approved isolation or compensating controls while monitoring vendor fixes and exploitation.
  3. Verify network reachability and remove or isolate the unneeded device urgently.
  4. Validate the vulnerability and evidence before displacing confirmed urgent remediation work.

Explanation

Correct Answer

B:

Zero-day exposure needs interim risk reduction even without a patch. Mitigate unpatched zero-day exposure.

Incorrect Answers

A:

Working exploitation code raises near-term attack likelihood. That is relevant to exploit availability and risk priority, not to mitigate unpatched zero-day exposure.

C:

Abandoned reachable infrastructure can remain an active attack path. It could help prioritize exploitable forgotten appliance, but it would not mitigate unpatched zero-day exposure.

D:

Unverified claims should not override known exploitability priorities. That is relevant to exploit availability and risk priority, not to mitigate unpatched zero-day exposure.


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