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Public proof of concept

CVE-2021-20086

A public proof of concept exists; no exploitation attested.

  • Published2021-04-23
  • WeaknessCWE-1321

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in jquery-bbq 1.2.1 allows a malicious user to inject properties into Object.prototype.

Timeline

dates in UTC
  1. 2021-04-2319:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 03:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-20086?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-20086?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

OSV · NVD
jquery-bbq
BranchAffectedFixed in
1.2≤ 1.2.1no fix published
Jquery-bbq project jquery-bbq
BranchAffectedFixed in
1.2= 1.2.1no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

No fix published by the sources we read yet. NVD record

Detection

read 2026-11-02 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2021-04-23
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-7w8j-85wm-6xfq

Frequently asked questions

What is CVE-2021-20086?

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in jquery-bbq 1.2.1 allows a malicious user to inject properties into Object.prototype.

Is CVE-2021-20086 actively exploited?

Active exploitation of CVE-2021-20086 has not been confirmed. Its EPSS score was 6.1% on 2026-11-02, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-20086?

CVE-2021-20086 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record