What’s Vulnerable › Vulnerabilities

CVE-2021-20087

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-04-23 · updated 2026-06-17
• Weakness: CWE-1321

Description

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.

Affected products

• jquery-deparam: 0.5.1

References

• https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/jquery-deparam.md
• https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/jquery-deparam.md
• https://github.com/RetireJS/retire.js/blob/6da45fcb6a3425e55ee8181b2ac35168879bf086/repository/jsrepository-master.json#L824-L842

Get alerted when CVE-2021-20087 or the next vulnerability affects your stack