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CVE-2021-3766

32
FAUCET Score

CVE-2021-3766 is a critical prototype pollution vulnerability affecting objection.js, specifically within the objection_project. With a CVSS score of 9.8, this flaw allows unauthenticated attackers to remotely execute arbitrary code, compromise data, and disrupt services with low attack complexity. Although there is no evidence of active exploitation, public exploit code, or inclusion in CISA's KEV catalog, the vulnerability has garnered significant community discussion, indicating awareness among security researchers.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.2.16CPE matchmatch criteria
cpe:2.3:a:objection_project:objection:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.47%
Probability of exploitation in next 30 days
EPSS Percentile
71.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0147 is in the 58th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: objectionFixed in: 2.2.16

Vendor Advisories (1)

npmGHSA-r659-8xfp-j327critical

objection.js Prototype Pollution vulnerability

Sep 7, 2021

References

github.com / Vincit/objection.js/commit/46b842a6bc897198b83f41ac85c92864b991d7e9
PatchThird Party Advisory
huntr.dev / bounties/c98e0f0e-ebf2-4072-be73-a1848ea031cc
ExploitIssue TrackingPatchThird Party Advisory