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Vulnerability details: VCID-7nbd-n4ew-guf5
Vulnerability ID VCID-7nbd-n4ew-guf5
Aliases CVE-2021-23383
GHSA-765h-qjxv-5f44
Summary Prototype Pollution in handlebars The package handlebars before 4.7.7 are vulnerable to Prototype Pollution when selecting certain compiling options to compile templates coming from an untrusted source.
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CWE-94 Improper Control of Generation of Code ('Code Injection')
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
cvssv3 9.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-23383.json
epss 0.05294 https://api.first.org/data/v1/epss?cve=CVE-2021-23383
cvssv3 9.8 https://github.com/advisories/GHSA-765h-qjxv-5f44
cvssv3.1_qr CRITICAL https://github.com/advisories/GHSA-765h-qjxv-5f44
cvssv3.1 9.8 https://github.com/handlebars-lang/handlebars.js
generic_textual CRITICAL https://github.com/handlebars-lang/handlebars.js
cvssv3.1 9.8 https://github.com/handlebars-lang/handlebars.js/commit/f0589701698268578199be25285b2ebea1c1e427
generic_textual CRITICAL https://github.com/handlebars-lang/handlebars.js/commit/f0589701698268578199be25285b2ebea1c1e427
cvssv3.1 9.8 https://github.com/rubysec/ruby-advisory-db/blob/master/gems/handlebars-source/CVE-2021-23383.yml
generic_textual CRITICAL https://github.com/rubysec/ruby-advisory-db/blob/master/gems/handlebars-source/CVE-2021-23383.yml
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2021-23383
generic_textual CRITICAL https://nvd.nist.gov/vuln/detail/CVE-2021-23383
cvssv3.1 9.8 https://security.netapp.com/advisory/ntap-20210618-0007
generic_textual CRITICAL https://security.netapp.com/advisory/ntap-20210618-0007
cvssv3.1 9.8 https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARS-1279031
generic_textual CRITICAL https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARS-1279031
cvssv3.1 9.8 https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWER-1279032
generic_textual CRITICAL https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWER-1279032
cvssv3.1 9.8 https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1279030
generic_textual CRITICAL https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1279030
cvssv3.1 9.8 https://snyk.io/vuln/SNYK-JS-HANDLEBARS-1279029
generic_textual CRITICAL https://snyk.io/vuln/SNYK-JS-HANDLEBARS-1279029
cvssv3.1 9.8 https://www.npmjs.com/package/handlebars
generic_textual CRITICAL https://www.npmjs.com/package/handlebars
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-23383.json
https://api.first.org/data/v1/epss?cve=CVE-2021-23383
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23383
https://github.com/handlebars-lang/handlebars.js
https://github.com/handlebars-lang/handlebars.js/commit/f0589701698268578199be25285b2ebea1c1e427
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/handlebars-source/CVE-2021-23383.yml
https://nvd.nist.gov/vuln/detail/CVE-2021-23383
https://security.netapp.com/advisory/ntap-20210618-0007
https://security.netapp.com/advisory/ntap-20210618-0007/
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARS-1279031
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWER-1279032
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1279030
https://snyk.io/vuln/SNYK-JS-HANDLEBARS-1279029
https://www.npmjs.com/package/handlebars
1956688 https://bugzilla.redhat.com/show_bug.cgi?id=1956688
GHSA-765h-qjxv-5f44 https://github.com/advisories/GHSA-765h-qjxv-5f44
RHSA-2021:2500 https://access.redhat.com/errata/RHSA-2021:2500
RHSA-2021:3016 https://access.redhat.com/errata/RHSA-2021:3016
RHSA-2021:4032 https://access.redhat.com/errata/RHSA-2021:4032
RHSA-2021:4628 https://access.redhat.com/errata/RHSA-2021:4628
RHSA-2023:1334 https://access.redhat.com/errata/RHSA-2023:1334
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://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-23383.json
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/handlebars-lang/handlebars.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

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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/handlebars-lang/handlebars.js/commit/f0589701698268578199be25285b2ebea1c1e427
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/rubysec/ruby-advisory-db/blob/master/gems/handlebars-source/CVE-2021-23383.yml
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

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none

required

unchanged

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none

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low

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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-2021-23383
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

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none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://security.netapp.com/advisory/ntap-20210618-0007
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

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none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARS-1279031
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

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none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWER-1279032
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://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1279030
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://snyk.io/vuln/SNYK-JS-HANDLEBARS-1279029
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://www.npmjs.com/package/handlebars
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 0.89543
EPSS Score 0.05294
Published At June 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-01T12:24:07.804882+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/02/GHSA-765h-qjxv-5f44/GHSA-765h-qjxv-5f44.json 36.1.3