CVE-2021-20083

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 4%CVSS: 8.8Exploit: None knownExposed: 0

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

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in jquery-plugin-query-object 2.2.3 allows a malicious user to inject properties into Object.prototype.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: Track

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
Severity88% × 45%
Exploitation4% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
4%
EPSS %ILE
90%
KEV
Not listed

Published

April 23, 2021

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Aug 25, 2026
No patch confirmed yet.
generic

[SECURITY] Fedora 36 Update: wordpress-5.9.2-1.fc36 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IJX6NVXSRN3RX3YUVEJQ4WUTQSDL3DSR/
generic

[SECURITY] Fedora 35 Update: wordpress-5.9.2-1.fc35 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7CR6VGITIB2TXXZ6B5QRRWPU5S4BXQPD/
generic

client-side-prototype-pollution/pp/jquery-query-object.md at master · BlackFan/client-side-prototype-pollution · GitHub

https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/jquery-query-object.md
generic

Locked Out | Packet Storm

http://packetstormsecurity.com/files/166299/WordPress-Core-5.9.0-5.9.1-Cross-Site-Scripting.html

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
npmjquery-query-object—ghsa

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.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
jquery-query-object———

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 28× 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 154 total refreshes for this CVE.

  1. 2026-09-18 19:23 UTCEPSS rescore
  2. 2026-09-17 19:23 UTCEPSS rescore
  3. 2026-09-16 14:05 UTCEPSS rescore
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  11. 2026-09-06 18:13 UTCOSV refresh
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  1. 2026-08-23 00:16 UTCEPSS rescore
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  3. 2026-08-20 22:52 UTCEPSS rescore
  4. 2026-08-20 04:15 UTCOSV refresh
  5. 2026-08-19 17:01 UTCEPSS rescore
  6. 2026-08-18 13:45 UTCEPSS rescore
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  8. 2026-08-16 14:52 UTCEPSS rescore
  9. 2026-08-16 02:11 UTCEPSS rescore
  10. 2026-08-15 01:27 UTCEPSS rescore
  11. 2026-08-13 21:57 UTCEPSS rescore
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  19. 2026-08-04 23:40 UTCOSV refresh
  20. 2026-08-04 15:06 UTCEPSS rescore
  21. 2026-08-04 10:34 UTCEPSS rescore
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  25. 2026-07-30 16:25 UTCEPSS rescore
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  32. 2026-07-23 01:56 UTCEG score recompute
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  37. 2026-07-20 17:04 UTCEPSS rescore
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  40. 2026-07-18 21:59 UTCOSV refresh
  41. 2026-07-18 10:02 UTCEPSS rescore
  42. 2026-07-16 17:00 UTCEPSS rescore
  43. 2026-07-15 16:55 UTCEPSS rescore
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  45. 2026-07-15 01:57 UTCEPSS rescore
  46. 2026-07-13 22:27 UTCEPSS rescore
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  48. 2026-07-12 05:44 UTCEPSS rescore
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  50. 2026-07-11 08:25 UTCEPSS rescore
  51. 2026-07-09 19:07 UTCEPSS rescore
  52. 2026-07-08 15:12 UTCEPSS rescore
  53. 2026-07-06 16:25 UTCEPSS rescore
  54. 2026-07-06 02:21 UTCEPSS rescore
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  60. 2026-07-02 16:57 UTCEPSS rescore
  61. 2026-07-01 15:03 UTCEPSS rescore
  62. 2026-07-01 04:48 UTCOSV refresh
  63. 2026-06-30 23:20 UTCEPSS rescore
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  65. 2026-06-29 14:04 UTCEPSS rescore
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  72. 2026-06-25 13:48 UTCEPSS rescore
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  74. 2026-06-24 14:03 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2021-20083?
CVE-2021-20083 is a high vulnerability published on April 23, 2021. Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in jquery-plugin-query-object 2.2.3 allows a malicious user to inject properties into Object.prototype.
When was CVE-2021-20083 disclosed?
CVE-2021-20083 was first published in the National Vulnerability Database on April 23, 2021, 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-2021-20083 actively exploited?
CVE-2021-20083 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4% probability of exploitation in the next 30 days, which ranks it in the top 9.5% of all scored CVEs.
What is the CVSS score of CVE-2021-20083?
CVE-2021-20083 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2021-20083?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-20083, 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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