CS0-003 Vulnerability Management Practice Question
A security team uses the Common Vulnerability Scoring System (CVSS) v3.1 to prioritize vulnerabilities. They find a vulnerability with a base score of 7.5 and vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. However, the asset is a public-facing web server with no backups. The team also checks the Exploit Prediction Scoring System (EPSS) and sees a score of 0.95 (95% probability of exploitation in the next 30 days). Which action should the team take first based on prioritizing by risk?
⚠ Common exam trap
CS0-004 often tests whether candidates over-index on a single metric — the trap is choosing 'patch within 30 days' based on the High (not Critical) CVSS score while ignoring the EPSS 0.95 and the no-backup context that together demand emergency action.
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
✓
Expedite patch testing and deployment, and consider emergency change procedures
With a CVSS base score of 7.5 (High) affecting a public-facing web server, no backups, and an EPSS score of 0.95 indicating a 95% probability of exploitation within 30 days, the risk is extreme — active exploitation is imminent and recovery would be impossible without backups. The correct first action is to expedite patch testing and deployment while invoking emergency change procedures to compress the normal change-management timeline without abandoning testing. This balances urgency with the operational discipline required to avoid introducing new outages.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Expedite patch testing and deployment, and consider emergency change procedures
Why this is correct
When a critical asset is affected by a vulnerability with a high Exploit Prediction Scoring System (EPSS) score, the probability of active exploitation is imminent. Expediting patch testing through an accelerated QA process and utilizing emergency change management procedures balances the urgent need to remediate the flaw with the necessity of preventing operational disruption. This approach ensures the vulnerability is closed rapidly without bypassing critical stability checks.
- ✗
Apply the patch within the next 30 days as part of routine maintenance
Why it's wrong here
A standard 30-day patch cycle is inadequate for high-risk vulnerabilities on critical assets, especially when EPSS indicates a high likelihood of exploitation. Delaying remediation leaves the organization exposed to active threat actors who can weaponize the vulnerability long before the routine maintenance window occurs. Vulnerability management policies must dynamically escalate patching timelines based on threat intelligence and asset criticality.
- ✗
Implement a network-based intrusion prevention system signature to block exploitation attempts
Why it's wrong here
While deploying an IPS signature serves as an effective compensating control, it does not remediate the underlying vulnerability and can be bypassed by encrypted traffic or alternative attack vectors. Relying solely on network-level blocks introduces a false sense of security and delays the necessary host-level remediation. Compensating controls should supplement, not replace, the primary objective of patching the vulnerable software.
- ✗
Deploy the patch immediately in the production environment without testing
Why it's wrong here
Deploying patches directly to production systems without any validation testing introduces severe operational risk, potentially causing system instability, service outages, or compatibility conflicts on critical assets. Even under emergency conditions, organizations must perform rapid, sandboxed testing to verify basic functionality before deployment. Bypassing testing entirely violates change management best practices and can result in self-inflicted denial-of-service conditions.
Go deeper
Related to this question
Learn chapter
Vulnerability Scanning Techniques
Key term
Security
Security in IT is the practice of protecting systems, networks, and data from unauthorized access, damage, or theft.
Key term
Asset
In IT and cybersecurity, an asset is anything valuable that an organization owns or controls, including data, hardware, software, people, and intellectual property.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This CS0-004 practice question is part of Courseiva's free CompTIA 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 CS0-004 exam.