Incident Classification and Categorization

Incident classification and categorization are fundamental steps in effective information security incident management.

These processes involve systematically identifying, assessing, and grouping incidents based on their nature, origin, and impact, allowing organizations to prioritize responses and allocate resources effectively.

ISO/IEC 27035 emphasizes structured classification schemes to ensure consistency, improve communication across teams, and enhance the efficiency of incident resolution.

Incident Classification: Understanding Severity and Impact

Classification primarily focuses on evaluating the severity or impact of an incident on organizational assets, operations, and reputation.

Severity levels often range from low to critical or very serious, defined by measurable criteria such as financial loss, data confidentiality breaches, service disruption, regulatory impact, or reputational damage. For example:

1. Low Severity: Minor incidents with negligible operational impact or recoverable quickly without significant cost.

2. Medium Severity: Incidents causing moderate disruption or data exposure requiring formal remediation.

3. High Severity: Serious incidents leading to significant operational impact, data loss, or legal consequences.

4. Critical Severity: Extremely damaging incidents causing severe business interruption or regulatory penalties.

Incident Categorization: Organizing by Type and Source

Categorization groups incidents according to their characteristics or source, helping responders apply appropriate expertise and tactics. Common categories include:

1. Technical Attacks: Malware infections, denial-of-service (DoS) attacks, unauthorized access.

2. Physical Incidents: Theft, vandalism, environmental events like fire or flood.

3. Human Errors: Accidental data disclosure, misconfiguration, procedural mistakes.

4. Natural Disasters: Earthquakes, power outages impacting data centers.

5. Operational Failures: Software bugs, system crashes, infrastructure failures.