CVE-2020-8125

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 4.1% (90th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 4.1%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Flaw in input validation in npm package klona version 1.1.0 and earlier may allow prototype pollution attack that may result in remote code execution or denial of service of applications using klona.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
50
EG Risk 50/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation4% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
4.1%
EPSS %ILE
90th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

February 4, 2020

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated Oct 4, 2026
Patch available.
generic

HackerOne

https://hackerone.com/reports/778414

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
klona—
  • every version up to 1.1.1: fixed in 1.1.1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 25× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 163 total refreshes for this CVE.

  1. 2026-10-05 17:40 UTCEPSS rescore
  2. 2026-10-03 14:22 UTCEPSS rescore
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  6. 2026-09-30 15:24 UTCEG score recompute
  7. 2026-09-30 14:59 UTCEPSS rescore
  8. 2026-09-27 13:41 UTCEPSS rescore
  9. 2026-09-27 10:07 UTCOSV refresh
  10. 2026-09-26 15:54 UTCEPSS rescore
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  23. 2026-09-07 19:51 UTCOSV refresh
  24. 2026-09-07 15:58 UTCEPSS rescore
  25. 2026-09-06 13:44 UTCEPSS rescore
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  1. 2026-09-05 15:25 UTCEPSS rescore
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  11. 2026-08-26 14:42 UTCEPSS rescore
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  13. 2026-08-21 05:14 UTCOSV refresh
  14. 2026-08-19 17:00 UTCEPSS rescore
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  26. 2026-08-06 13:43 UTCEPSS rescore
  27. 2026-08-05 20:21 UTCOSV refresh
  28. 2026-08-05 19:14 UTCEPSS rescore
  29. 2026-08-04 15:06 UTCEPSS rescore
  30. 2026-08-04 10:34 UTCEPSS rescore
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  39. 2026-07-23 14:15 UTCEPSS rescore
  40. 2026-07-23 01:55 UTCEG score recompute
  41. 2026-07-22 22:41 UTCEG score recompute
  42. 2026-07-22 14:05 UTCEPSS rescore
  43. 2026-07-21 15:22 UTCEPSS rescore
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  45. 2026-07-20 17:04 UTCEPSS rescore
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  47. 2026-07-19 20:18 UTCOSV refresh
  48. 2026-07-19 14:28 UTCEPSS rescore
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  50. 2026-07-19 02:26 UTCEPSS rescore
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  63. 2026-07-09 19:07 UTCEPSS rescore
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  65. 2026-07-07 13:43 UTCEPSS rescore
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  73. 2026-07-02 16:57 UTCEPSS rescore
  74. 2026-07-02 10:55 UTCOSV refresh
  75. 2026-07-01 15:03 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2020-8125?
CVE-2020-8125 is a critical vulnerability published on February 4, 2020. Flaw in input validation in npm package klona version 1.1.0 and earlier may allow prototype pollution attack that may result in remote code execution or denial of service of applications using klona.
When was CVE-2020-8125 disclosed?
CVE-2020-8125 was first published on February 4, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-8125 actively exploited?
CVE-2020-8125 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.1% probability of exploitation in the next 30 days (90th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-8125?
CVE-2020-8125 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2020-8125?
A fix for CVE-2020-8125 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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