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CVSS 3.1 Base Score Calculator
x402
CVSS 3.1 Base Score Calculator is a paid API for AI agents from agentstoolshub.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-27).
Computes the exact CVSS 3.1 base score, severity band, and metric breakdown from a CVSS vector string using the official FIRST specification.
Price / call$0.01
Success—
StatusUnknown
How this service works
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.
Output
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.
Example use cases
Score a newly found vulnerability
“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?”
Triage CVE severity before patching
“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?”
Verify CVE score from NVD lookup
“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?”
Technical details
Endpoint
GEThttps://agentstoolshub.com/api/v1/security/cvss-calc?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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