CVE-2020-5258

HIGHNVD 7.77.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.7 under NVD CVSS v3. EPSS exploit probability: 1.5%, top 18% 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
7.7
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 4%CVSS: 7.7Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In affected versions of dojo (NPM package), the deepCopy method is vulnerable to Prototype Pollution. Prototype Pollution refers to the ability to inject properties into existing JavaScript language construct prototypes, such as objects. An attacker manipulates these attributes to overwrite, or pollute, a JavaScript application object prototype of the base object by injecting other values. This has been patched in versions 1.12.8, 1.13.7, 1.14.6, 1.15.3 and 1.16.2

CVSS v3
7.7
EG Score
7.7(medium)
EPSS
89.4%
KEV
Not listed

Published

March 10, 2020

Last Modified

November 21, 2024

References (22)

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
dojo—1.16.2—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 48× 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. 2026-07-22 14:05 UTCEPSS rescore
  2. 2026-07-21 15:22 UTCEPSS rescore
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  6. 2026-07-19 17:18 UTCOSV refresh
  7. 2026-07-19 14:28 UTCEPSS rescore
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  1. 2026-07-07 13:43 UTCEPSS rescore
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  9. 2026-07-02 16:57 UTCEPSS rescore
  10. 2026-07-02 06:17 UTCOSV refresh
  11. 2026-07-01 15:03 UTCEPSS rescore
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  36. 2026-06-14 07:43 UTCOSV refresh
  37. 2026-06-13 22:58 UTCEPSS rescore
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  43. 2026-06-10 22:16 UTCEPSS rescore
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  45. 2026-06-08 14:15 UTCEPSS rescore
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  67. 2026-05-27 13:39 UTCEPSS rescore
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  69. 2026-05-27 06:53 UTCEG score recompute
  70. 2026-05-26 13:42 UTCEPSS rescore
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  72. 2026-05-26 07:17 UTCEPSS rescore
  73. 2026-05-26 07:17 UTCEPSS rescore
  74. 2026-05-26 04:16 UTCOSV refresh

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2020-5258?
CVE-2020-5258 is a high vulnerability published on March 10, 2020. In affected versions of dojo (NPM package), the deepCopy method is vulnerable to Prototype Pollution. Prototype Pollution refers to the ability to inject properties into existing JavaScript language construct prototypes, such as objects. An attacker manipulates these attributes to overwrite, or…
When was CVE-2020-5258 disclosed?
CVE-2020-5258 was first published in the National Vulnerability Database on March 10, 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-2020-5258 actively exploited?
CVE-2020-5258 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 89.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-5258?
CVE-2020-5258 has a CVSS v3 base score of 7.7 (NVD).
How do I remediate CVE-2020-5258?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-5258, 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.

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