Stop chasing severity. Rank by what's actually exploitable — EPSS probability, CISA KEV, and proven reachability.
Most scanners hand you a wall of CVSS scores and call it a day. heimdallX cross-references every finding against real-world exploit signals — EPSS exploit probability and the CISA Known Exploited Vulnerabilities (KEV) catalog — then re-ranks your queue so the issues attackers are actually using rise to the top. This is the paradigm the security market moved to in 2025–2026: from "detect and scan" to "validate exploitability."
A high CVSS score doesn't mean anyone is exploiting it. heimdallX multiplies its base priority (severity × exploit-maturity × confidence) by EPSS exploit probability, and floors anything in the CISA KEV catalog to the top of the queue. A vulnerability with a modest score but active exploitation jumps the line — exactly the way an attacker prioritizes targets.
Enrichment is only as good as its matching. heimdallX attaches a CVE only when it's explicitly cited in evidence, or when it matches a precise product-and-version range (e.g. Apache 2.4.49, OpenSSL 3.0.0–3.0.6). It never guesses, so KEV/EPSS enrichment never invents a vulnerability you don't actually have.
The validation layer degrades gracefully: with no API keys it still ranks findings with deterministic exploit playbooks; wired to live EPSS and KEV feeds it sharpens the ranking with up-to-the-day exploit intelligence. Either way, the fix-first queue reflects real-world risk.
Identify technologies and exact versions on the asset.
Attach CVEs by cited id or precise version range — never guessed.
Pull EPSS probability and CISA KEV status for each CVE.
Weight by EPSS, floor known-exploited issues to the top.
$ scan acme-corp.com→ Apache httpd 2.4.49 detectedmatched CVE-2021-41773 · CISA KEV: yesEPSS 0.975 → priority 21 → 90 (KEV floor)→ Log4j CVE-2021-44228 · EPSS 0.99999 · KEV
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