Building Patch Tuesday Response Process
Overview
Microsoft releases security updates on the second Tuesday of each month ("Patch Tuesday"), addressing vulnerabilities across Windows, Office, Exchange, SQL Server, Azure services, and other products. In 2025, Microsoft patched over 1,129 vulnerabilities across the year -- an 11.9% increase from 2024 -- making a structured response process critical. The leading risk types include elevation of privilege (49%), remote code execution (34%), and information disclosure (7%). This skill covers building a repeatable Patch Tuesday response workflow from initial advisory review through testing, deployment, and validation.
When to Use
- When deploying or configuring building patch tuesday response process capabilities in your environment
- When establishing security controls aligned to compliance requirements
- When building or improving security architecture for this domain
- When conducting security assessments that require this implementation
Prerequisites
- Access to Microsoft Security Response Center (MSRC) update guide
- Vulnerability management platform (Qualys VMDR, Rapid7, Tenable)
- Patch deployment infrastructure (WSUS, SCCM/MECM, Intune, or third-party)
- Test environment mirroring production configurations
- Change management process (ITIL-based or equivalent)
- Communication channels for cross-team coordination
Core Concepts
Patch Tuesday Timeline
| Day | Activity | Owner |
|---|
| T+0 (Tuesday 10 AM PT) | Microsoft releases patches and advisories | Microsoft |
| T+0 (Tuesday afternoon) | Security team reviews advisories and triages | Security Ops |
| T+1 (Wednesday) | Qualys/vendor scan signatures updated | VM Platform |
| T+1-T+2 | Emergency patches deployed for zero-days | IT Operations |
| T+2-T+5 | Test patches in staging environment | QA/IT Ops |
| T+5-T+7 | Deploy to Pilot group (5-10% of fleet) | IT Operations |
| T+7-T+14 | Deploy to Production Ring 1 (servers) | IT Operations |
| T+14-T+21 | Deploy to Production Ring 2 (workstations) | IT Operations |
| T+21-T+30 | Validation scanning and compliance reporting | Security Ops |
Patch Categorization Framework
| Category | Criteria | Response SLA |
|---|
| Zero-Day / Exploited | Active exploitation confirmed, CISA KEV listed | 24-48 hours |
| Critical RCE | CVSS >= 9.0, remote code execution, no auth required | 3-5 days |
| Critical with Exploit | Public exploit code or EPSS > 0.7 | 7 days |
| High Severity | CVSS 7.0-8.9, privilege escalation | 14 days |
| Medium Severity | CVSS 4.0-6.9 | 30 days |
| Low / Informational | CVSS < 4.0, defense-in-depth | Next maintenance window |
Microsoft Product Categories to Monitor
| Category | Products | Risk Level |
|---|
| Windows OS | Windows 10, 11, Server 2016-2025 | Critical |
| Exchange Server | Exchange 2016, 2019, Online | Critical |
| SQL Server | SQL 2016-2022 | High |
| Office Suite | Microsoft 365, Office 2019-2024 | High |
| .NET Framework | .NET 4.x, .NET 6-9 | Medium |
| Azure Services | Azure AD, Entra ID, Azure Stack | High |
| Edge/Browser | Edge Chromium, IE mode | Medium |
| Development Tools | Visual Studio, VS Code | Low |
Workflow
Step 1: Pre-Patch Tuesday Preparation (Monday before)
Preparation Checklist:
[ ] Confirm WSUS/SCCM sync schedules are active
[ ] Verify test environment is available and current
[ ] Review outstanding patches from previous month
[ ] Confirm monitoring dashboards are operational
[ ] Pre-stage communication templates
[ ] Ensure rollback procedures are documented
[ ] Verify backup jobs ran successfully on critical servers
Step 2: Day-of Triage (Patch Tuesday)
Triage Process:
1. Monitor MSRC Update Guide (https://msrc.microsoft.com/update-guide)
2. Review Microsoft Security Blog for advisory summaries
3. Cross-reference with CISA KEV additions (same day)
4. Check vendor advisories (Qualys, Rapid7, CrowdStrike analysis)
5. Identify zero-day and actively exploited vulnerabilities
6. Classify each CVE by severity and applicability
7. Determine deployment rings and timeline for each patch
8. Submit emergency change request for zero-day patches
9. Communicate triage results to IT Operations and management
Step 3: Scan and Gap Analysis
# Post-Patch-Tuesday scan workflow
def run_patch_tuesday_scan(scanner_api, target_groups):
"""Trigger vulnerability scans after Patch Tuesday updates."""
for group in target_groups:
print(f"[*] Scanning {group['name']}...")
scan_id = scanner_api.launch_scan(
target=group["targets"],
template="patch-tuesday-focused",
credentials=group["creds"]
)
print(f" Scan launched: {scan_id}")
# Wait for scan completion, then generate report
results = scanner_api.get_scan_results(scan_id)
missing_patches = [r for r in results if r["status"] == "missing"]
# Categorize by Patch Tuesday release
current_month = [p for p in missing_patches
if p["vendor_advisory_date"] >= patch_tuesday_date]
return {
"total_missing": len(missing_patches),
"current_month": len(current_month),
"zero_day": [p for p in current_month if p.get("actively_exploited")],
"critical": [p for p in current_month if p["cvss"] >= 9.0],
}
Step 4: Ring-Based Deployment Strategy
Ring 0 - Emergency (0-48 hours):
Scope: Zero-day and actively exploited CVEs only
Method: Manual or targeted push (SCCM expedite)
Targets: Internet-facing servers, critical infrastructure
Approval: Emergency change, verbal CISO approval
Rollback: Immediate rollback if service degradation
Ring 1 - Pilot (Day 2-7):
Scope: All critical and high patches
Method: WSUS/SCCM automatic deployment
Targets: IT department machines, test group (5-10%)
Approval: Standard change with CAB notification
Monitoring: 48-hour soak period, check for BSOD, app crashes
Ring 2 - Production Servers (Day 7-14):
Scope: All security patches
Method: SCCM maintenance windows (off-hours)
Targets: Production servers by tier
Approval: Standard change with CAB approval
Monitoring: Application health checks, performance baseline
Ring 3 - Workstations (Day 14-21):
Scope: All security patches + quality updates
Method: Windows Update for Business / Intune
Targets: All managed workstations
Approval: Pre-approved standard change
Monitoring: Help desk ticket monitoring for issues
Ring 4 - Stragglers (Day 21-30):
Scope: Catch remaining unpatched systems
Method: Forced deployment with restart
Targets: Systems that missed prior rings
Approval: Compliance-driven enforcement
Step 5: Validation and Reporting
Post-Deployment Validation:
1. Re-scan environment with updated vulnerability signatures
2. Compare pre-patch and post-patch scan results
3. Calculate patch compliance rate per ring and department
4. Identify failed patches and investigate root causes
5. Generate compliance report for management review
6. Update risk register with residual unpatched vulnerabilities
7. Document exceptions and compensating controls
Best Practices
- Subscribe to MSRC notifications and vendor analysis blogs for early intelligence
- Maintain a dedicated Patch Tuesday war room or Slack/Teams channel
- Always patch zero-day vulnerabilities outside the normal ring schedule
- Test patches against critical business applications before broad deployment
- Track patch compliance metrics month-over-month for trend analysis
- Maintain rollback procedures for every deployment ring
- Coordinate with application owners for compatibility testing
- Document all exceptions with compensating controls and review dates
Common Pitfalls
- Deploying all patches simultaneously without ring-based testing
- Not scanning after patching to validate remediation
- Treating all patches equally without risk-based prioritization
- Ignoring cumulative update dependencies causing patch failures
- Not accounting for server reboot requirements in maintenance windows
- Failing to communicate patch status to business stakeholders
Related Skills
- implementing-rapid7-insightvm-for-scanning
- performing-cve-prioritization-with-kev-catalog
- implementing-vulnerability-remediation-sla
- implementing-patch-management-workflow
