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PT0-001 · Question #133

A penetration tester delivers a web application vulnerability scan report to a client. The penetration tester rates a vulnerability as medium severity. The same vulnerability was reported as a…

The correct answer is D. Thera are currently no known exploits for this vulnerability. Vulnerability severity can decrease between assessments when exploitability factors change, such as the absence of publicly known exploit code lowering the practical risk.

Vulnerability discovery and analysis

Question

A penetration tester delivers a web application vulnerability scan report to a client. The penetration tester rates a vulnerability as medium severity. The same vulnerability was reported as a critical severity finding on the previous report. Which of the following is the MOST likely reason for the reduced severity?

Options

  • AThe client has applied a hot fix without updating the version.
  • BThe threat landscape has significantly changed.
  • CThe client has updated their codebase with new features.
  • DThera are currently no known exploits for this vulnerability.

How the community answered

(50 responses)
  • A
    8% (4)
  • B
    6% (3)
  • C
    2% (1)
  • D
    84% (42)

Why each option

Vulnerability severity can decrease between assessments when exploitability factors change, such as the absence of publicly known exploit code lowering the practical risk.

AThe client has applied a hot fix without updating the version.

A hot fix that resolves the underlying issue would typically result in the vulnerability being removed from the report entirely, not simply reduced in severity.

BThe threat landscape has significantly changed.

A significantly changed threat landscape would more likely raise severity rather than lower it, as new threat actors and attack techniques tend to increase risk over time.

CThe client has updated their codebase with new features.

Adding new features to the codebase does not reduce the severity of a pre-existing vulnerability and could even expand the attack surface.

DThera are currently no known exploits for this vulnerability.Correct

CVSS severity scoring includes exploitability metrics that directly influence the overall score. When no known public exploits exist for a vulnerability, the exploitability subscore drops significantly, which can lower the overall rating from critical to medium. This reflects the reduced likelihood that an attacker can successfully leverage the flaw in the current threat environment.

Concept tested: CVSS exploitability metrics and vulnerability severity rating

Source: https://www.first.org/cvss/v3.1/specification-document

Topics

#vulnerability severity#CVSS scoring#exploit availability#risk assessment

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