Computer Security Incident

Overview

A computer security incident is an occurrence that threatens or violates the confidentiality, integrity, availability, or authorized operation of computing resources. Examples include malware, unauthorized access, data exposure, denial of service, compromised credentials, and malicious system changes.

Not every alert or unusual event becomes an incident. Organizations classify incidents using evidence, scope, impact, affected assets, adversary activity, and defined response criteria, while keeping escalation flexible as new information appears.

Response includes detection, triage, containment, evidence preservation, eradication, recovery, communication, and lessons learned. Teams should document decisions, coordinate legal and compliance duties, and avoid destroying forensic information while attempting urgent technical repair. Post-incident reviews should convert lessons into durable improvements.

A computer security incident is an event that actually or potentially compromises information systems, data, services, security controls, or authorized use. Computer Security Incident should distinguish an alert, suspected event, confirmed incident, material impact, and restored service because each state requires different decisions and notifications. Computer Security Incident must define the affected service or asset, event severity, business and customer impact, evidence, responsible roles, containment priority, recovery objective, and reporting obligations. A security incident requires coordinated technical and organizational response, with evidence preservation and evolving assessment as facts become clearer.

A production treatment of Computer Security Incident should test an event that actually or potentially compromises information systems, data, services, security controls, or authorized use within the relevant asset, decision, or service state. The Computer Security Incident context record for event that actually, potentially compromises information systems, and data should preserve source data, configuration or policy version, responsible actor, exception, and outcome. Review of Computer Security Incident should determine whether safeguards addressing event that actually, potentially compromises information systems, and data changed exposure in practice, not merely whether a document or setting existed.