CVE-2021-20083 (GCVE-0-2021-20083)
Vulnerability from cvelistv5 – Published: 2021-04-23 18:47 – Updated: 2024-08-03 17:30Summary
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.
Severity
8.8 (High)
CWE
- Prototype Pollution
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/BlackFan/client-side-prototype… | x_refsource_MISC |
| http://packetstormsecurity.com/files/166299/WordP… | x_refsource_MISC |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | jquery-plugin-query-object |
Affected:
2.2.3
|
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 8a9fb02b-4f73-4934-9b34-671783c56650
Exploited: Yes
Timestamps
First Seen: 2022-03-11
Asserted: 2022-03-11
Scope
Notes: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in jquery-plugin-query-object 2.2.3 allows a malicious... | Affected: jQuery / jquery-plugin-query-object | CVSS: 8.8 (HIGH) | EPSS: 0.04186 | Used in malware: unknown | Not yet in CISA KEV: True
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: previdian
Details
| Feed | Previdian (previdian.com) |
|---|---|
| Title | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in jquery-plugin-query-object 2.2.3 allows a malicious... |
| Cve Id | CVE-2021-20083 |
| Vendor | jQuery |
| Ghsa Id | GHSA-Q9XG-H756-8689 |
| Product | jquery-plugin-query-object |
| Added Date | 2022-03-11T08:00:34.000Z |
| Cvss Score | 8.8 |
| Epss Score | 0.04186 |
| Previous Ids | |
| Cvss Severity | HIGH |
| Virtual Patch | False |
| Cvss Estimated | False |
| Epss Percentile | 0.90614 |
| Used In Malware | unknown |
| Vulnerability Id | CVE-2021-20083 |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | True |
References
Created: 2026-10-02 09:10 CEST
| Updated: 2026-10-02 09:10 CEST
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-03T17:30:07.501Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/jquery-query-object.md"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "http://packetstormsecurity.com/files/166299/WordPress-Core-5.9.0-5.9.1-Cross-Site-Scripting.html"
},
{
"name": "FEDORA-2022-956b6078fb",
"tags": [
"vendor-advisory",
"x_refsource_FEDORA",
"x_transferred"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7CR6VGITIB2TXXZ6B5QRRWPU5S4BXQPD/"
},
{
"name": "FEDORA-2022-706aac2786",
"tags": [
"vendor-advisory",
"x_refsource_FEDORA",
"x_transferred"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IJX6NVXSRN3RX3YUVEJQ4WUTQSDL3DSR/"
}
],
"title": "CVE Program Container"
}
],
"cna": {
"affected": [
{
"product": "jquery-plugin-query-object",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "2.2.3"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Improperly Controlled Modification of Object Prototype Attributes (\u0027Prototype Pollution\u0027) in jquery-plugin-query-object 2.2.3 allows a malicious user to inject properties into Object.prototype."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "Prototype Pollution",
"lang": "en",
"type": "text"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2022-03-26T18:06:51.000Z",
"orgId": "5ac1ecc2-367a-4d16-a0b2-35d495ddd0be",
"shortName": "tenable"
},
"references": [
{
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/jquery-query-object.md"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "http://packetstormsecurity.com/files/166299/WordPress-Core-5.9.0-5.9.1-Cross-Site-Scripting.html"
},
{
"name": "FEDORA-2022-956b6078fb",
"tags": [
"vendor-advisory",
"x_refsource_FEDORA"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7CR6VGITIB2TXXZ6B5QRRWPU5S4BXQPD/"
},
{
"name": "FEDORA-2022-706aac2786",
"tags": [
"vendor-advisory",
"x_refsource_FEDORA"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IJX6NVXSRN3RX3YUVEJQ4WUTQSDL3DSR/"
}
],
"x_legacyV4Record": {
"CVE_data_meta": {
"ASSIGNER": "vulnreport@tenable.com",
"ID": "CVE-2021-20083",
"STATE": "PUBLIC"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "jquery-plugin-query-object",
"version": {
"version_data": [
{
"version_value": "2.2.3"
}
]
}
}
]
},
"vendor_name": "n/a"
}
]
}
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"value": "Improperly Controlled Modification of Object Prototype Attributes (\u0027Prototype Pollution\u0027) in jquery-plugin-query-object 2.2.3 allows a malicious user to inject properties into Object.prototype."
}
]
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "Prototype Pollution"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/jquery-query-object.md",
"refsource": "MISC",
"url": "https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/jquery-query-object.md"
},
{
"name": "http://packetstormsecurity.com/files/166299/WordPress-Core-5.9.0-5.9.1-Cross-Site-Scripting.html",
"refsource": "MISC",
"url": "http://packetstormsecurity.com/files/166299/WordPress-Core-5.9.0-5.9.1-Cross-Site-Scripting.html"
},
{
"name": "FEDORA-2022-956b6078fb",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7CR6VGITIB2TXXZ6B5QRRWPU5S4BXQPD/"
},
{
"name": "FEDORA-2022-706aac2786",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IJX6NVXSRN3RX3YUVEJQ4WUTQSDL3DSR/"
}
]
}
}
}
},
"cveMetadata": {
"assignerOrgId": "5ac1ecc2-367a-4d16-a0b2-35d495ddd0be",
"assignerShortName": "tenable",
"cveId": "CVE-2021-20083",
"datePublished": "2021-04-23T18:47:42.000Z",
"dateReserved": "2020-12-17T00:00:00.000Z",
"dateUpdated": "2024-08-03T17:30:07.501Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2021-20083",
"date": "2026-10-09",
"epss": "0.04186",
"percentile": "0.90678"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"product": "jquery-plugin-query-object",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "2.2.3"
}
]
}
],
"source": "vulnreport@tenable.com"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:jquery-plugin-query-object_project:jquery-plugin-query-object:2.2.3:*:*:*:*:*:*:*",
"matchCriteriaId": "D2ADE6D8-C532-4BA8-84CB-62E7C3500D61",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Improperly Controlled Modification of Object Prototype Attributes (\u0027Prototype Pollution\u0027) in jquery-plugin-query-object 2.2.3 allows a malicious user to inject properties into Object.prototype."
},
{
"lang": "es",
"value": "Una Modificaci\u00f3n Controlada Inapropiadamente de Object Prototype Attributes (\"Prototype Pollution\") en jquery-plugin-query-object versi\u00f3n 2.2.3, permite a un usuario malicioso inyectar propiedades en Object.prototype"
}
],
"id": "CVE-2021-20083",
"lastModified": "2026-06-17T03:33:14.783",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "SINGLE",
"availabilityImpact": "PARTIAL",
"baseScore": 6.5,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:L/Au:S/C:P/I:P/A:P",
"version": "2.0"
},
"exploitabilityScore": 8.0,
"impactScore": 6.4,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 5.9,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2021-04-23T19:15:09.163",
"references": [
{
"source": "vulnreport@tenable.com",
"tags": [
"Third Party Advisory",
"VDB Entry"
],
"url": "http://packetstormsecurity.com/files/166299/WordPress-Core-5.9.0-5.9.1-Cross-Site-Scripting.html"
},
{
"source": "vulnreport@tenable.com",
"tags": [
"Exploit",
"Third Party Advisory"
],
"url": "https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/jquery-query-object.md"
},
{
"source": "vulnreport@tenable.com",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7CR6VGITIB2TXXZ6B5QRRWPU5S4BXQPD/"
},
{
"source": "vulnreport@tenable.com",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IJX6NVXSRN3RX3YUVEJQ4WUTQSDL3DSR/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory",
"VDB Entry"
],
"url": "http://packetstormsecurity.com/files/166299/WordPress-Core-5.9.0-5.9.1-Cross-Site-Scripting.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Exploit",
"Third Party Advisory"
],
"url": "https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/jquery-query-object.md"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7CR6VGITIB2TXXZ6B5QRRWPU5S4BXQPD/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IJX6NVXSRN3RX3YUVEJQ4WUTQSDL3DSR/"
}
],
"sourceIdentifier": "vulnreport@tenable.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-1321"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"current_release_date": "2025-11-21T15:59:24+00:00",
"cve": "CVE-2021-20083",
"id": "CVE-2021-20083",
"initial_release_date": "2021-01-01T00:00:00+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "wordpress: WordPress Core 5.9.0 / 5.9.1 Cross Site Scripting",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-20083.json",
"version": "3"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…