Patch Management Coverage Calculator

ANA›Life Services Authority›National Calculator Authority›Patch Management Coverage Calculator

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Patch Management Coverage Calculator

Evaluate your organization's patch management effectiveness by calculating coverage rate, mean time to patch (MTTP), and an overall risk exposure score.

Total Managed Assets (devices/systems)

Assets Fully Patched (within policy window)

Total Critical Vulnerabilities Identified

Critical Vulnerabilities Remediated

Total Days to Remediate All Patched Vulnerabilities (sum)

Patch Policy Window (days) — e.g. 30 for critical

Assets with Overdue Patches (past policy window)

Calculate

function patCalc() { const resultDiv = document.getElementById('pat-result');

const totalAssets = parseFloat(document.getElementById('pat-total-assets').value); const patchedAssets = parseFloat(document.getElementById('pat-patched-assets').value); const criticalVulns = parseFloat(document.getElementById('pat-critical-vulns').value); const remediatedVulns = parseFloat(document.getElementById('pat-remediated-vulns').value); const totalPatchDays = parseFloat(document.getElementById('pat-total-patch-days').value); const policyWindow = parseFloat(document.getElementById('pat-policy-window').value); const overdueAssets = parseFloat(document.getElementById('pat-overdue-assets').value);

// --- Validation --- if (isNaN(totalAssets) || isNaN(patchedAssets) || isNaN(criticalVulns) || isNaN(remediatedVulns) || isNaN(totalPatchDays) || isNaN(policyWindow) || isNaN(overdueAssets)) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠ Please fill in all fields.'; return; } if (totalAssets ⚠ Total managed assets must be at least 1.'; return; } if (patchedAssets > totalAssets) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠ Patched assets cannot exceed total assets.'; return; } if (remediatedVulns > criticalVulns) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠ Remediated vulnerabilities cannot exceed total critical vulnerabilities.'; return; } if (overdueAssets > totalAssets) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠ Overdue assets cannot exceed total assets.'; return; } if (policyWindow ⚠ Policy window must be at least 1 day.'; return; } if (totalPatchDays ⚠ Total patch days cannot be negative.'; return; }

// --- Formulas ---

// 1. Patch Coverage Rate (PCR) // PCR = (Patched Assets / Total Assets) × 100 const patchCoverageRate = (patchedAssets / totalAssets) * 100;

// 2. Vulnerability Remediation Rate (VRR) // VRR = (Remediated Critical Vulns / Total Critical Vulns) × 100 // If no critical vulns, VRR = 100% const vulnRemediationRate = (criticalVulns === 0) ? 100 : (remediatedVulns / criticalVulns) * 100;

// 3. Mean Time to Patch (MTTP) in days // MTTP = Total Days to Remediate / Remediated Vulnerabilities // If nothing remediated yet, MTTP = N/A const mttp = (remediatedVulns === 0) ? null : (totalPatchDays / remediatedVulns);

// 4. Compliance Rate (CR) — assets patched within policy window // CR = ((Total Assets - Overdue Assets) / Total Assets) × 100 const complianceRate = ((totalAssets - overdueAssets) / totalAssets) * 100;

// 5. Risk Exposure Score (RES) — composite 0–100 (higher = more risk) // RES = 100 - (0.40 × PCR + 0.35 × VRR + 0.25 × CR) // Weighted blend: coverage 40%, vuln remediation 35%, compliance 25% const res = 100 - (0.40 * patchCoverageRate + 0.35 * vulnRemediationRate + 0.25 * complianceRate);

// 6. Patch Gap (unpatched assets) const patchGap = totalAssets - patchedAssets;

// 7. Unpatched Critical Vulns const unpatchedVulns = criticalVulns - remediatedVulns;

// --- Rating labels --- function coverageRating(pcr) { if (pcr >= 95) return {label: 'Excellent', color: '#27ae60'}; if (pcr >= 85) return {label: 'Good', color: '#2980b9'}; if (pcr >= 70) return {label: 'Fair', color: '#f39c12'}; return {label: 'Poor', color: '#c0392b'}; }

function resRating(score) { if (score

Metric Value Rating

Patch Coverage Rate (PCR) ${patchCoverageRate.toFixed(1)}% ${cRating.label}

Vulnerability Remediation Rate (VRR) ${vulnRemediationRate.toFixed(1)}% ${coverageRating(vulnRemediationRate).label}

Mean Time to Patch (MTTP) ${mttpDisplay} ${mRating.label}

Policy Compliance Rate ${complianceRate.toFixed(1)}% ${coverageRating(complianceRate).label}

Risk Exposure Score (RES) ${res.toFixed(1)} / 100 ${rRating.label}

📌 Summary: • ${patchGap} asset(s) remain unpatched out of ${totalAssets} total. • ${unpatchedVulns} critical vulnerability/ies still unpatched. • ${overdueAssets} asset(s) are overdue beyond the ${policyWindow}-day policy window. • Overall Risk Exposure Score: ${res.toFixed(1)} — ${rRating.label}.

`; }

#### Formulas Used

1. Patch Coverage Rate (PCR): PCR = (Patched Assets ÷ Total Assets) × 100

2. Vulnerability Remediation Rate (VRR): VRR = (Remediated Critical Vulnerabilities ÷ Total Critical Vulnerabilities) × 100

3. Mean Time to Patch (MTTP): MTTP = Sum of Days to Remediate Each Vulnerability ÷ Number of Remediated Vulnerabilities

4. Policy Compliance Rate (CR): CR = ((Total Assets − Overdue Assets) ÷ Total Assets) × 100

5. Risk Exposure Score (RES): RES = 100 − (0.40 × PCR + 0.35 × VRR + 0.25 × CR) Weighted composite: Coverage 40%, Vulnerability Remediation 35%, Compliance 25%. Score of 0 = no risk; 100 = maximum risk.

#### Assumptions & References

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