CUI Endpoint Vulnerability Remediation Playbook

Overview

Designed and documented a repeatable process to scan, patch, and verify FortiClient endpoint CVE remediation on controlled CUI (Controlled Unclassified Information) systems at the Applied Physics Laboratory, University of Washington.

Problem

CUI-designated systems required rapid CVE remediation without disrupting active research operations conducted by scientists, engineers, and researchers, some under DoD, NASA, and Navy contracts. Systems needed to maintain ISO 27001-aligned compliance while keeping downtime minimal.

Approach

• Passive, non-interruptive scanning to identify vulnerabilities without disrupting research workflows (FortiClient)
• Test-bench validation on isolated CUI machines before deploying patches to production endpoints
• Staged rollout across 100+ CUI endpoints, prioritizing critical and high vulnerabilities
• Post-patch verification with follow-up scans to confirm all flagged CVEs were remediated
• Knowledge base documentation: authored wiki guides and FAQ entries standardizing the remediation process

Outcome

• Accelerated secure posture improvements across 100+ CUI endpoints
• Wiki and KB guides reduced front-line troubleshooting toil by ~50%
• Established a repeatable playbook that new IT staff could follow without prior CUI experience

Lessons Learned

• Passive scanning is essential in environments where uptime is non-negotiable
• Test-bench validation catches edge cases that vendor patch notes don’t always cover
• Documentation is the multiplier. A good playbook turns a specialist task into a standard operating procedure