CS0-003 Vulnerability Management Practice Question
A security analyst is using the EPSS to prioritize vulnerabilities for remediation. EPSS is designed to estimate the likelihood that a vulnerability will be exploited in the wild. Which of the following best describes how EPSS should be used in vulnerability management?
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
✓
EPSS should be used as one of several factors in a risk-based prioritization approach.
EPSS provides a probability score (0-1) that a vulnerability will be exploited in the wild within 30 days. It should be used alongside other factors like asset criticality and business context for prioritization.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
EPSS is only relevant for high-severity vulnerabilities with a CVSS score above 9.0.
Why it's wrong here
The Exploit Prediction Scoring System (EPSS) calculates the probability of exploitation for any CVE, regardless of its CVSS base score. Many low- or medium-severity vulnerabilities are actively exploited in the wild, making EPSS highly relevant for identifying these hidden threats. Restricting EPSS analysis to scores above 9.0 would cause an organization to miss critical, highly exploitable vulnerabilities that attackers frequently chain together.
- ✗
EPSS replaces the need for vulnerability scanning because it predicts exploitability.
Why it's wrong here
EPSS is a predictive model that estimates the likelihood of a vulnerability being exploited, but it cannot detect which vulnerabilities actually exist within an organization's unique environment. Vulnerability scanning is still required to discover active software flaws, misconfigurations, and open ports across the network. EPSS acts as a prioritization overlay on top of scan results rather than a replacement for the scanning process itself.
- ✗
EPSS alone should determine the remediation order, ignoring asset criticality.
Why it's wrong here
Relying solely on EPSS to order remediation tasks ignores the business impact of a potential compromise. A highly exploitable vulnerability on an isolated test machine poses far less risk than a moderately exploitable vulnerability on a critical database containing sensitive customer data. Effective risk management requires combining threat probability metrics like EPSS with internal asset criticality and exposure data.
- ✓
EPSS should be used as one of several factors in a risk-based prioritization approach.
Why this is correct
Modern vulnerability management relies on risk-based prioritization, which integrates threat intelligence, asset value, and vulnerability severity. EPSS provides a dynamic, data-driven estimate of exploit probability in the wild, which helps analysts filter out thousands of vulnerabilities that are unlikely to ever be leveraged. When combined with CVSS severity and internal asset criticality, EPSS enables security teams to allocate remediation resources to the highest-risk areas first.
Go deeper
Related to this question
Learn chapter
Infrastructure-as-Code Security Scanning
Key term
Remediation
Remediation is the process of fixing or eliminating vulnerabilities, misconfigurations, or security weaknesses in an IT environment.
Key term
Vulnerability
A vulnerability is a weakness in a system, network, or software that could be exploited by a threat to cause harm or unauthorized access.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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