CVE-2021-20087

8.8 HIGH 2% exploit odds No fix listed

What it is

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in jquery-deparam 0.5.1 allows a malicious user to inject properties into Object.prototype.

At a glance

Exploitability: Can be exploited over the network with a low-privilege account. High risk of data exposure, data tampering, service disruption.
Exploit odds: 2.1% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2020-12-17 00:00 UTC ReservedThe CVE id was reserved by its CNA
2021-04-23 18:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:33 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 2.1% in the next 30 days (EPSS).
Severity: 8.8 HIGH (CVSS).
Fix: none linked yet, which raises it.

Details

Published: 2021-04-23 18:15 UTC
Last modified: 2026-06-17 03:33 UTC
Exploit probability: 2.1% · EPSS, next 30 days
Weakness: CWE-1321 · Prototype pollution
Record status: Modified

Affected

Acemetrix jquery-deparam 0.5.1

Attack profile CVSS 3.1 · 8.8

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Raw vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-20087.md and follow it. Check whether this project is affected by CVE-2021-20087. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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References

NVD record · CVE.org record