How severe is CVE-2021-20084?

CVE-2021-20084 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-20084 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20084?

CVE-2021-20084 affects Jquery-sparkle Project Jquery-sparkle. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20084?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-20084 published?

CVE-2021-20084 was published on 2021-04-23 and last updated on 2026-06-17.

CVE-2021-20084

CVE-2021-20084 is a high-severity vulnerability in Jquery-sparkle Project Jquery-sparkle with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1321.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1321
Affected product: Jquery-sparkle Project Jquery-sparkle
Published: 2021-04-23
Last modified: 2026-06-17

Description

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in jquery-sparkle 1.5.2-beta allows a malicious user to inject properties into Object.prototype.

Frequently asked questions

What is CVE-2021-20084?: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in jquery-sparkle 1.5.2-beta allows a malicious user to inject properties into Object.prototype.
How severe is CVE-2021-20084?: CVE-2021-20084 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-20084 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20084?: CVE-2021-20084 affects Jquery-sparkle Project Jquery-sparkle. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20084?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-20084 published?: CVE-2021-20084 was published on 2021-04-23 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:jquery-sparkle_project:jquery-sparkle:1.5.2:beta:*:*:*:*:*:*

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