Security Vulnerability Risk Score Calculator

ANA›Life Services Authority›National Calculator Authority›Security Vulnerability Risk Score Calculator

.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; } }

Security Vulnerability Risk Score Calculator

Calculate a comprehensive vulnerability risk score using CVSS v3.1-inspired metrics. Enter the vulnerability characteristics to compute Base Score, Temporal Score, and Environmental Score with severity rating.

### Base Score Metrics

Attack Vector (AV)

Network (N) — Remotely exploitable Adjacent (A) — Requires adjacent network Local (L) — Requires local access Physical (P) — Requires physical access

Attack Complexity (AC)

Low (L) — No special conditions required High (H) — Special conditions required

Privileges Required (PR)

None (N) — No privileges needed Low (L) — Basic user privileges High (H) — Admin privileges needed

User Interaction (UI)

None (N) — No user interaction needed Required (R) — User must take action

Scope (S)

Unchanged (U) — Impact limited to vulnerable component Changed (C) — Impact extends beyond vulnerable component

### Impact Metrics

Confidentiality Impact (C)

High (H) — Total loss of confidentiality Low (L) — Some loss of confidentiality None (N) — No confidentiality impact

Integrity Impact (I)

High (H) — Total loss of integrity Low (L) — Some loss of integrity None (N) — No integrity impact

Availability Impact (A)

High (H) — Total loss of availability Low (L) — Some loss of availability None (N) — No availability impact

### Temporal Score Metrics

Exploit Code Maturity (E)

Not Defined (X) High (H) — Functional exploit exists Functional (F) — Functional PoC exists Proof-of-Concept (P) — PoC exists Unproven (U) — Theoretical only

Remediation Level (RL)

Not Defined (X) Unavailable (U) — No solution available Workaround (W) — Unofficial fix available Temporary Fix (T) — Official temp fix Official Fix (O) — Official patch available

Report Confidence (RC)

Not Defined (X) Confirmed (C) — Confirmed by vendor Reasonable (R) — Reasonable confidence Unknown (U) — Unconfirmed report

### Environmental Metrics

Confidentiality Requirement (CR)

Not Defined (X) High (H) — Critical confidentiality need Medium (M) — Moderate confidentiality need Low (L) — Limited confidentiality need

Integrity Requirement (IR)

Not Defined (X) High (H) — Critical integrity need Medium (M) — Moderate integrity need Low (L) — Limited integrity need

Availability Requirement (AR)

Not Defined (X) High (H) — Critical availability need Medium (M) — Moderate availability need Low (L) — Limited availability need

Calculate Risk Score

Fill in all fields and click Calculate to see the risk score.

function secRoundUp(value) { // CVSS 3.1 official rounding: round up to 1 decimal place var intInput = Math.round(value * 100000); if (intInput % 10000 === 0) { return intInput / 100000; } else { return (Math.floor(intInput / 10000) + 1) / 10; } }

function secSeverityLabel(score) { if (score === 0.0) return { label: "None", color: "#6c757d" }; if (score ';

function scoreCard(title, score, sev) { return '' + '' + title + '' + '' + score.toFixed(1) + '' + '' + sev.label + '' + ''; }

html += scoreCard("Base Score", BaseScore, baseSev); html += scoreCard("Temporal Score", TemporalScore, tempSev); html += scoreCard("Environmental Score", EnvScore, envSev); html += '' + 'Overall Risk Score' + '' + overallScore.toFixed(1) + '' + '' + overallSev.label + '' + ''; html += '';

// Score breakdown bar html += '' + 'Overall Risk Score (0–10)' + '' + '' + '' + '' + '0 None4 Low7 Medium9 High10 Critical' + '';

// Component breakdown html += '' + 'Score Components:' + 'ISS (Impact Sub-Score): ' + ISS.toFixed(4) + '' + 'Impact Score: ' + Impact.toFixed(4) + '' + 'Exploitability Score: ' + Exploitability.toFixed(4) + '' + 'MISS (Modified Impact Sub-Score): ' + MISS.toFixed(4) + '' + 'CVSS Vector:' + '' + vectorString + '' + '';

// Recommendations html += '' + 'Recommended Action: '; if (overallScore >= 9.0) { html += 'CRITICAL — Patch immediately. Escalate to security team. Isolate affected systems if possible.'; } else if (overallScore >= 7.0) { html += 'HIGH — Apply patch within 7 days. Implement compensating controls immediately.'; } else if (overallScore >= 4.0) { html += 'MEDIUM — Schedule patch within 30 days. Monitor for exploitation attempts.'; } else if (overallScore > 0.0) { html += 'LOW — Address in next maintenance cycle. Document and track.'; } else { html += 'NONE — No action required at this time.'; } html += '';

document.getElementById("sec-result").innerHTML = html; }

#### Formulas Used (CVSS v3.1)

Impact Sub-Score (ISS): ISS = 1 − [(1 − C) × (1 − I) × (1 − A)]

Impact Score: Scope Unchanged: Impact = 6.42 × ISS Scope Changed: Impact = 7.52 × [ISS − 0.029] − 3.25 × [ISS − 0.02]15

Exploitability Score: ESS = 8.22 × AV × AC × PR × UI

Base Score: If ISS ≤ 0: BaseScore = 0 Scope Unchanged: BaseScore = RoundUp(Min(Impact + ESS, 10)) Scope Changed: BaseScore = RoundUp(Min(1.08 × (Impact + ESS), 10))

Temporal Score: TemporalScore = RoundUp(BaseScore × E × RL × RC)

Modified Impact Sub-Score (MISS): MISS = Min(1 − [(1 − C×CR) × (1 − I×IR) × (1 − A×AR)], 0.915)

Environmental Score: Scope Unchanged: EnvScore = RoundUp(RoundUp(Min(ModImpact + ModESS, 10)) × E × RL × RC) Scope Changed: EnvScore = RoundUp(RoundUp(Min(1.08 × (ModImpact + ModESS), 10)) × E × RL × RC)

Overall Risk Score (weighted composite): Overall = RoundUp(Base × 0.40 + Temporal × 0.30 + Environmental × 0.30)

RoundUp Function: Rounds to the nearest 0.1 toward positive infinity (CVSS 3.1 specification).

#### Assumptions & References

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References

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