CVSS Calculator | Free CVSS 3.1 Score & Vector Calculator

CVSS calculator with the official v3.1 base and temporal equations. Score a vulnerability or paste a vector string from NVD to decode it. Shows impact and exploitability subscores. Designed specifically for developers and professionals, this free online calculator runs entirely in your browser to process tasks quickly and securely. Enjoy unlimited usage with no data tracking and no registration required.

Also known as: cvss calculator · cvss 3.1 calculator online · cvss vector string parser · cvss base score calculator · vulnerability severity calculator · cvss temporal score

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CVSS v3.1 Metrics

0 of 8 set

Paste a vector string from NVD (optional)

Base metrics (all required)

Attack Vector (AV)

How remote can the attacker be?

Attack Complexity (AC)

Are there conditions outside the attacker's control?

Privileges Required (PR)

What access does the attacker need beforehand?

User Interaction (UI)

Must a human other than the attacker do something?

Scope (S)

Does impact spread beyond the vulnerable component?

Confidentiality Impact (C)

How much data can the attacker read?

Integrity Impact (I)

How much data can the attacker modify?

Availability Impact (A)

Can the attacker deny service?

Temporal metrics (optional - they can only lower the score)

Exploit Code Maturity (E)

Does working exploit code exist in the wild?

Remediation Level (RL)

Is there a fix available yet?

Report Confidence (RC)

How sure are we the vulnerability is real?

Score

Your CVSS score will appear here

Choose all eight base metrics, or paste a vector string.

About CVSS Calculator

Score a vulnerability with the official CVSS v3.1 base and temporal equations, or paste a vector string from NVD to decode it back into readable metrics. Shows the impact and exploitability subscores behind the number, so you can see exactly why a finding landed where it did. Runs entirely in your browser.

Key Features

Full CVSS v3.1 base scoring with the specification's exact impact, exploitability and round-up equations
Optional temporal metrics for exploit code maturity, remediation level and report confidence
Paste any CVSS:3.1 vector string from NVD, GitHub advisories or a scanner report to decode it instantly
Impact subscore, exploitability subscore and ISS shown alongside the final score for auditability
Plain-English explanation of every metric value as you select it, plus the severity band table

Use Cases

Scoring a finding for a pentest report or a security advisory you are publishing
Sanity-checking a vendor-assigned CVSS score against your own environment
Decoding a vector string from an NVD entry or dependency scanner into readable terms
Showing why scope change or required user interaction moves a score by whole points

Related Keywords

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Privacy & Security

All processing happens locally in your browser. Your data never leaves your computer, ensuring complete privacy and security.

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Frequently asked questions

What is CVSS Calculator used for?

CVSS calculator with the official v3.1 base and temporal equations. Score a vulnerability or paste a vector string from NVD to decode it. Shows impact and exploitability subscores.

Is CVSS Calculator free to use?

Yes. CVSS Calculator is completely free with no usage limits, and there is no paid tier required to use it.

Do I need an account to use CVSS Calculator?

No. CVSS Calculator works immediately in your browser with no signup, login, or email address required.

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