CVE-2021-42581

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 62% of all CVEs by exploit prediction. 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
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.1Exploit: NoneExposed: 0

A fix is available — apply it.

Prototype poisoning in function mapObjIndexed in Ramda 0.27.0 and earlier allows attackers to compromise integrity or availability of application via supplying a crafted object (that contains an own property "__proto__") as an argument to the function. NOTE: the vendor disputes this because the observed behavior only means that a user can create objects that the user didn't know would contain custom prototypes

CVSS v3
9.1
EG Score
9.1(medium)
EPSS
67.6%
KEV
Not listed

Published

May 10, 2022

Last Modified

November 21, 2024

References (4)

Vendor Advisories for CVE-2021-42581(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhceph/rhceph-6-dashboard-rhel9:6-752023-06-15redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 49× 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.

  1. 2026-07-11 08:25 UTCEPSS rescore
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  3. 2026-07-09 19:07 UTCEPSS rescore
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  19. 2026-06-29 10:32 UTCOSV refresh
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  1. 2026-06-25 13:48 UTCEPSS rescore
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  24. 2026-06-12 23:10 UTCEPSS rescore
  25. 2026-06-12 02:27 UTCOSV refresh
  26. 2026-06-11 13:58 UTCEPSS rescore
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  28. 2026-06-10 22:16 UTCEPSS rescore
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  46. 2026-05-31 22:29 UTCEPSS rescore
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  50. 2026-05-29 13:42 UTCEPSS rescore
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  59. 2026-05-26 07:17 UTCEPSS rescore
  60. 2026-05-25 22:33 UTCEG score recompute
  61. 2026-05-25 22:33 UTCVendor advisory
  62. 2026-05-25 22:33 UTCGHSA enrichment
  63. 2026-05-25 20:16 UTCOSV refresh

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2021-42581?
CVE-2021-42581 is a critical vulnerability published on May 10, 2022. Prototype poisoning in function mapObjIndexed in Ramda 0.27.0 and earlier allows attackers to compromise integrity or availability of application via supplying a crafted object (that contains an own property "proto") as an argument to the function. NOTE: the vendor disputes this because the…
When was CVE-2021-42581 disclosed?
CVE-2021-42581 was first published in the National Vulnerability Database on May 10, 2022, 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-2021-42581 actively exploited?
CVE-2021-42581 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 67.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-42581?
CVE-2021-42581 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2021-42581?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-42581, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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