Framework: NIST 800-53 Audio Course

Flaw Remediation (SI-2) ensures that software and system vulnerabilities are identified, prioritized, and corrected in a timely and verifiable manner. For exam purposes, recognize that SI-2 connects vulnerability discovery to patch management and change control. It requires that organizations track all known flaws, evaluate risk impact, and implement corrective actions according to documented timelines aligned with severity and system criticality. This control covers operating systems, applications, firmware, and third-party components. The goal is to close exploitable gaps before adversaries can use them while maintaining service stability and evidence of due diligence.

Operationally, SI-2 relies on structured workflows linking vulnerability scanning, threat intelligence, and ticketing systems. Each identified flaw becomes a tracked item with owner, risk rating, remediation plan, and verification record. Automated patch management tools deploy updates across environments, while change control ensures that patches are tested and approved prior to production. Evidence includes patch deployment reports, exception logs for deferred updates, and verification scans confirming closure. Metrics such as mean time to remediate (MTTR), patch compliance rate, and percentage of critical vulnerabilities open beyond policy thresholds demonstrate program health. Pitfalls include poor asset visibility, ad hoc prioritization, and failure to verify patch success. Mastering SI-2 means maintaining a measurable, repeatable remediation process that balances urgency, assurance, and operational reliability.
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