Server Vulnerability Patch Priority Scorer

ANA›Life Services Authority›National Calculator Authority›Server Vulnerability Patch Priority Scorer

.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }

Server Vulnerability Patch Priority Scorer

Calculate a weighted patch priority score for server vulnerabilities by combining CVSS severity, asset criticality, network exposure, and exploit availability. Use the score to triage and schedule remediation efforts.

CVSS Base Score (0.0 – 10.0)

Asset Criticality (1 = Low, 2 = Medium, 3 = High, 4 = Critical)

Network Exposure Score (1 = Internal only, 2 = DMZ/Restricted, 3 = Internet-facing)

Exploit Availability (1 = No known exploit, 2 = PoC exists, 3 = Active exploitation in wild)

Days Since Vulnerability Disclosed (0 – 3650)

Calculate Priority Score

Fill in all fields and click Calculate.

function serCalc() { var resultDiv = document.getElementById('ser-result');

var cvss = parseFloat(document.getElementById('ser-cvss').value); var criticality = parseInt(document.getElementById('ser-criticality').value); var exposure = parseInt(document.getElementById('ser-exposure').value); var exploit = parseInt(document.getElementById('ser-exploit').value); var age = parseInt(document.getElementById('ser-age').value);

// --- Input Validation --- if (isNaN(cvss) || isNaN(criticality) || isNaN(exposure) || isNaN(exploit) || isNaN(age)) { resultDiv.innerHTML = '⚠ Please fill in all fields.'; return; } if (cvss 10) { resultDiv.innerHTML = '⚠ CVSS score must be between 0.0 and 10.0.'; return; } if (criticality 4) { resultDiv.innerHTML = '⚠ Asset Criticality must be 1, 2, 3, or 4.'; return; } if (exposure 3) { resultDiv.innerHTML = '⚠ Network Exposure must be 1, 2, or 3.'; return; } if (exploit 3) { resultDiv.innerHTML = '⚠ Exploit Availability must be 1, 2, or 3.'; return; } if (age 3650) { resultDiv.innerHTML = '⚠ Days since disclosure must be between 0 and 3650.'; return; }

// --- Formula --- // Normalize CVSS to 0–1 range var cvssNorm = cvss / 10.0;

// Normalize asset criticality to 0–1 range (1→0.25, 2→0.50, 3→0.75, 4→1.00) var critNorm = criticality / 4.0;

// Normalize exposure to 0–1 range (1→0.333, 2→0.667, 3→1.00) var expNorm = exposure / 3.0;

// Normalize exploit to 0–1 range (1→0.333, 2→0.667, 3→1.00) var exploitNorm = exploit / 3.0;

// Age factor: logarithmic growth capped at 1.0 // ageFactor = min(1.0, ln(age + 1) / ln(366)) // Rationale: urgency grows quickly in first year, then plateaus var ageFactor = Math.min(1.0, Math.log(age + 1) / Math.log(366));

// Weighted Priority Score (0–100) // Weights: CVSS 35%, Criticality 25%, Exposure 20%, Exploit 15%, Age 5% var score = ( 0.35 * cvssNorm + 0.25 * critNorm + 0.20 * expNorm + 0.15 * exploitNorm + 0.05 * ageFactor ) * 100;

score = Math.round(score * 10) / 10;

// --- Priority Band --- var band = ''; var bandColor = ''; var recommendation = '';

if (score >= 80) { band = 'Critical Priority'; bandColor = '#c0392b'; recommendation = 'Patch immediately — within 24 hours. Escalate to incident response if active exploitation is confirmed.'; } else if (score >= 60) { band = 'High Priority'; bandColor = '#e67e22'; recommendation = 'Patch within 7 days. Schedule emergency change window if needed.'; } else if (score >= 40) { band = 'Medium Priority'; bandColor = '#f1c40f'; recommendation = 'Patch within 30 days as part of the regular patch cycle.'; } else if (score >= 20) { band = 'Low Priority'; bandColor = '#27ae60'; recommendation = 'Patch within 90 days. Monitor for changes in exploit status.'; } else { band = 'Informational'; bandColor = '#2980b9'; recommendation = 'Address in next scheduled maintenance window. Re-evaluate if exposure or exploit status changes.'; }

// --- Component Breakdown --- var cvssContrib = Math.round(0.35 * cvssNorm * 100 * 10) / 10; var critContrib = Math.round(0.25 * critNorm * 100 * 10) / 10; var expContrib = Math.round(0.20 * expNorm * 100 * 10) / 10; var exploitContrib = Math.round(0.15 * exploitNorm * 100 * 10) / 10; var ageContrib = Math.round(0.05 * ageFactor * 100 * 10) / 10;

var exploitLabels = {1: 'No known exploit', 2: 'PoC exists', 3: 'Active exploitation'}; var exposureLabels = {1: 'Internal only', 2: 'DMZ/Restricted', 3: 'Internet-facing'}; var critLabels = {1: 'Low', 2: 'Medium', 3: 'High', 4: 'Critical'};

resultDiv.innerHTML = '### Patch Priority Score: ' + score + ' / 100 ' + '#### ' + band + ' ' + 'Recommendation: ' + recommendation + '

' + '' + '' + 'Factor' + 'Input' + 'Weight' + 'Contribution' + '' + '' + 'CVSS Base Score' + cvss + '35%' + cvssContrib + '' + 'Asset Criticality' + critLabels[criticality] + '25%' + critContrib + '' + 'Network Exposure' + exposureLabels[exposure] + '20%' + expContrib + '' + 'Exploit Availability' + exploitLabels[exploit] + '15%' + exploitContrib + '' + 'Days Since Disclosure' + age + ' days5%' + ageContrib + '' + '' + ''; }

#### Formula

Priority Score (0–100) = (0.35 × CVSSnorm + 0.25 × Criticalitynorm + 0.20 × Exposurenorm + 0.15 × Exploitnorm + 0.05 × AgeFactor) × 100

Where:

Priority Bands: Critical ≥ 80 | High ≥ 60 | Medium ≥ 40 | Low ≥ 20 | Informational < 20

#### Assumptions & References

More Calculators

References

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