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Security Concepts

Vulnerability Management

Vulnerability Management

Vulnerability management is the ongoing, systematic process of discovering, evaluating, prioritizing, and addressing security vulnerabilities across an organization's entire technology ecosystem.

The Vulnerability Management Lifecycle

  1. Discovery: Scanning and inventorying all assets across on-premises, cloud, and remote environments
  2. Prioritization: Evaluating vulnerabilities based on severity (CVSS), exploitability, asset criticality, and active exploitation in the wild
  3. Remediation: Applying patches, implementing compensating controls, or accepting risk
  4. Verification: Confirming remediation was successful and vulnerabilities are resolved
  5. Reporting: Tracking metrics on exposure time, remediation rates, and risk reduction

Key Challenges

  • Volume: Thousands of new CVEs published annually; prioritization is essential
  • Legacy Systems: Older systems may not have patches available
  • False Priorities: CVSS scores alone don't reflect real-world risk — context matters
  • Operational Constraints: Patching windows, compatibility testing, and uptime requirements
  • Cloud & Container Sprawl: Dynamic environments create continuous changes to the attack surface

Modern Approaches

  • Risk-Based Vulnerability Management (RBVM): Prioritizing based on business risk and threat context, not just CVSS
  • Attack Surface Management: Continuously discovering unknown and shadow IT assets
  • Continuous Scanning: Moving from periodic scans to always-on monitoring
  • Agent + Agentless: Combining both approaches for comprehensive coverage

Metrics That Matter

  • Mean Time to Remediate (MTTR) by severity
  • Percentage of critical vulnerabilities patched within SLA
  • Number of assets with unknown vulnerability status
  • Exposure window (time from disclosure to remediation)

Related Terms

Related Reading

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Attack Surface Management (ASM)

Attack Surface Management is the continuous, automated process of discovering, inventorying, classifying, assessing, and monitoring all external-facing assets and exposure points across an organization's digital footprint.

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SIEM

SIEM (Security Information and Event Management) is a security solution that collects, aggregates, and analyzes log and event data across an organization's IT environment to detect threats, support investigations, and enable compliance reporting.

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Breach and Attack Simulation (BAS)

Breach and Attack Simulation is an advanced security testing approach that uses automation to continuously simulate real-world attack techniques against an organization's infrastructure, providing ongoing validation of security controls.

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Security Validation

Security validation is the ongoing practice of testing, measuring, and verifying that an organization's security controls, tools, and processes are functioning correctly and effectively against real-world threats.

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