{"uid":"cap_pwPIus7uso9p1H_x59Gs8","slug":"cvss-3-1-base-score-calculator-44e1b6fc","name":"CVSS 3.1 Base Score Calculator","description":"Compute a CVSS 3.1 base score from its vector string using the exact FIRST specification (weights, scope handling, and the rounding function). Pairs with cve-lookup: paste any vector and get the score, severity band, and metric breakdown. Use this when an agent needs to vector string → exact base score.","url":"https://agentstoolshub.com/api/v1/security/cvss-calc?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["vector"],"properties":{"vector":{"type":"string","description":"CVSS vector"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_0wg2ETN2F52DGKB7mVgQ7","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Computes the exact CVSS 3.1 base score, severity band, and metric breakdown from a CVSS vector string using the official FIRST specification.","exampleAgentPrompt":"What's the CVSS 3.1 base score and severity for the vector AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H? Give me the full metric breakdown too.","exampleUseCases":[{"title":"Score a newly found vulnerability","prompt":"I found a vulnerability with CVSS vector AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N — what's the exact base score and severity rating?"},{"title":"Triage CVE severity before patching","prompt":"Before we prioritize this patch, can you calculate the CVSS 3.1 base score for AV:A/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N and tell me whether it's Low, Medium, High, or Critical?"},{"title":"Verify CVE score from NVD lookup","prompt":"I looked up CVE-2023-44487 and got the vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H — can you independently compute the base score and break down each metric so I can confirm it matches the NVD listing?"}],"resultDescription":"Returns the numerical CVSS 3.1 base score (0.0–10.0), the corresponding severity band (None, Low, Medium, High, or Critical), and a breakdown of each individual metric value extracted from the vector string, computed using the exact FIRST specification including scope handling and the official rounding function.","failureModes":["Invalid or malformed CVSS vector string returns an error or unparseable result","CVSS 2.0 or 4.0 vectors are not supported — only CVSS 3.1 vectors are accepted","Missing required vector components cause a validation failure","Partial vectors without all required metrics may return incorrect or incomplete scores"],"whenToPreferThis":"Choose this endpoint when you need the exact CVSS 3.1 base score computed from a raw vector string using the official FIRST specification — especially when pairing with a CVE lookup to independently verify or display scores. Prefer this over manual calculation or LLM-estimated scoring, as it applies precise weights, scope-changed handling, and the correct rounding function.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-11-01T06:48:43.986Z","isFirstParty":false,"canonicalSlug":"cvss-3-1-base-score-calculator-44e1b6fc"}