CVSS Score Calculator

CVSS Calculator is a fast, native scoring tool for security engineers, vulnerability analysts, penetration testers, and anyone who needs accurate CVSS base scores — without an internet connection, an account, or a browser. Score any vulnerability in seconds using the official scoring algorithms for CVSS v3.0, v3.1, and v4.0. Switch between versions instantly while preserving your selections, copy the full vector string with one tap, and share results directly to email, chat, or any documentation tool. KEY FEATURES • Complete support for CVSS 3.0, 3.1, and 4.0 base scoring — implementing the official FIRST.org reference algorithms • Live score and severity rating (Low, Medium, High, Critical) with color-coded results • One-tap copy of the full CVSS vector string • Save scored vectors to History with custom names — review, reload, or delete past calculations any time • Import existing vector strings — paste a CVSS string from a CVE, advisory, or ticket and every metric populates automatically • Share scores and vectors via the system share sheet • Universal app — native experiences on iPhone, iPad, and Mac • Choose a default CVSS version that opens whenever you launch the app • Optional portrait lock on iPhone • Fully offline — no telemetry, no accounts, no tracking. Your vulnerability data never leaves your device WHO IT'S FOR • Security engineers triaging incoming vulnerability reports • Penetration testers documenting findings on the go • CVE/advisory authors validating scores before publication • Bug bounty researchers scoring submissions • Students learning the CVSS framework • Anyone who wished the FIRST.org calculator was an app ABOUT CVSS The Common Vulnerability Scoring System (CVSS) is the industry-standard open framework for communicating the characteristics and severity of software vulnerabilities. This app implements CVSS 3.0, 3.1, and 4.0 base scoring exactly as published by FIRST.org. Questions, feature requests, or bugs? Tap Send Feedback in Settings — we read every message.