CVE-2021-23369

MEDIUMNVD 5.65.6—Elevated

5.6

The package handlebars before 4.7.7 are vulnerable to Remote Code Execution (RCE) when selecting certain compiling options to compile templates coming from an untrusted source.

CVSS v3: 5.6
EG Score: 5.6(medium)
EPSS: 87.9%
KEV: Not listed

Published

April 12, 2021

Last Modified

November 21, 2024

References (14)

report@snykhttps://github.com/handlebars-lang/handlebars.js/commit/b6d3de7123eebba603e321f04afdbae608e8fea8
report@snykhttps://github.com/handlebars-lang/handlebars.js/commit/f0589701698268578199be25285b2ebea1c1e427
report@snykhttps://security.netapp.com/advisory/ntap-20210604-0008/
report@snykhttps://snyk.io/vuln/SNYK-JAVA-ORGWEBJARS-1074950
report@snykhttps://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWER-1074951
report@snykhttps://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1074952
report@snykhttps://snyk.io/vuln/SNYK-JS-HANDLEBARS-1056767
af854a3a-2127-422b-91ae-364da2661108https://github.com/handlebars-lang/handlebars.js/commit/b6d3de7123eebba603e321f04afdbae608e8fea8
af854a3a-2127-422b-91ae-364da2661108https://github.com/handlebars-lang/handlebars.js/commit/f0589701698268578199be25285b2ebea1c1e427
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20210604-0008/
af854a3a-2127-422b-91ae-364da2661108https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARS-1074950
af854a3a-2127-422b-91ae-364da2661108https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWER-1074951
af854a3a-2127-422b-91ae-364da2661108https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1074952
af854a3a-2127-422b-91ae-364da2661108https://snyk.io/vuln/SNYK-JS-HANDLEBARS-1056767

Patch Availability(4)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
redhat	handlebars	2023-03-20	redhat
redhat	openshift-logging/kibana6-rhel8:v6.8.1-48	2021-11-17	redhat
redhat	openshift-logging/kibana6-rhel8:v6.8.1-47	2021-11-17	redhat
redhat	openshift4/ose-logging-kibana6:v4.6.0-202106181629.p0.git.40f3e72	2021-06-29	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 2 ecosystems)

Maven(3)

Package	Vulnerable range	Fixed in	Dependents
org.webjars.bowergithub.wycats:handlebars.js	4.1.1, 4.2.0, 4.4.5, 4.5.3, 4.7.2	4.7.7	—
org.webjars:handlebars	1.0.0 ... 4.7.6 (21 versions)	4.7.7	—
org.webjars.npm:handlebars	1.3.0 ... 4.7.6 (21 versions)	4.7.7	—

npm(1)

Package	Vulnerable range	Fixed in	Dependents
handlebars	—	4.7.7	—

All Vendor Advisories

(4)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× in last 7d / 17× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 18:29 UTCEG score recompute
2026-05-26 18:29 UTCVendor advisory
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-24 16:49 UTCepss_batch

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

GitHub PoCfazilbaig1/CVE-2021-23369
First seen Oct 19, 2024
Handlebars CVE-2021-23369 Vulnerability
Open source ↗

Frequently asked(5)

What is CVE-2021-23369?

CVE-2021-23369 is a medium vulnerability published on April 12, 2021. The package handlebars before 4.7.7 are vulnerable to Remote Code Execution (RCE) when selecting certain compiling options to compile templates coming from an untrusted source.

When was CVE-2021-23369 disclosed?

CVE-2021-23369 was first published in the National Vulnerability Database on April 12, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-23369 actively exploited?

CVE-2021-23369 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 87.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-23369?

CVE-2021-23369 has a CVSS v3 base score of 5.6 (NVD).

How do I remediate CVE-2021-23369?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-23369, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-23369

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