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Vulnerability details: VCID-mejp-jyvd-1uha
Vulnerability ID VCID-mejp-jyvd-1uha
Aliases CVE-2021-3766
GHSA-r659-8xfp-j327
Summary
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CWE-915 Improperly Controlled Modification of Dynamically-Determined Object Attributes
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00359 https://api.first.org/data/v1/epss?cve=CVE-2021-3766
epss 0.00359 https://api.first.org/data/v1/epss?cve=CVE-2021-3766
epss 0.00359 https://api.first.org/data/v1/epss?cve=CVE-2021-3766
epss 0.00359 https://api.first.org/data/v1/epss?cve=CVE-2021-3766
cvssv3.1_qr CRITICAL https://github.com/advisories/GHSA-r659-8xfp-j327
cvssv3.1 9.8 https://github.com/vincit/objection.js
generic_textual CRITICAL https://github.com/vincit/objection.js
cvssv3.1 9.8 https://github.com/Vincit/objection.js/commit/46b842a6bc897198b83f41ac85c92864b991d7e9
generic_textual CRITICAL https://github.com/Vincit/objection.js/commit/46b842a6bc897198b83f41ac85c92864b991d7e9
cvssv3.1 9.8 https://github.com/vincit/objection.js/commit/b41aab8dcd78f426f7468dcda541a7aca18a66a6
generic_textual CRITICAL https://github.com/vincit/objection.js/commit/b41aab8dcd78f426f7468dcda541a7aca18a66a6
cvssv3.1 9.8 https://huntr.dev/bounties/c98e0f0e-ebf2-4072-be73-a1848ea031cc
generic_textual CRITICAL https://huntr.dev/bounties/c98e0f0e-ebf2-4072-be73-a1848ea031cc
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2021-3766
generic_textual CRITICAL https://nvd.nist.gov/vuln/detail/CVE-2021-3766
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-3766
https://github.com/vincit/objection.js
https://github.com/Vincit/objection.js/commit/46b842a6bc897198b83f41ac85c92864b991d7e9
https://github.com/vincit/objection.js/commit/b41aab8dcd78f426f7468dcda541a7aca18a66a6
https://huntr.dev/bounties/c98e0f0e-ebf2-4072-be73-a1848ea031cc
https://nvd.nist.gov/vuln/detail/CVE-2021-3766
GHSA-r659-8xfp-j327 https://github.com/advisories/GHSA-r659-8xfp-j327
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/vincit/objection.js
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/Vincit/objection.js/commit/46b842a6bc897198b83f41ac85c92864b991d7e9
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/vincit/objection.js/commit/b41aab8dcd78f426f7468dcda541a7aca18a66a6
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://huntr.dev/bounties/c98e0f0e-ebf2-4072-be73-a1848ea031cc
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-3766
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.58523
EPSS Score 0.00359
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-12T02:02:40.921038+00:00 EPSS Importer Import https://epss.cyentia.com/epss_scores-current.csv.gz 38.6.0