BlackTreeCVE Intelligence
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Full vulnerability report · 2021
CVE-2021-23369High confidence

Remote Code Execution (RCE)

Unknown · handlebars

5.6MediumCVSS 3.1
Recommended action
Within 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:High, raised one band.upgradedsince 16 Sep 2024

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • A structured source references public exploit or proof-of-concept material.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 7.03% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs Unknown handlebars and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 30 daysRemediation target: Within 180 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Distribution package intelligence

Release-specific package status

Debian findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

4 package states
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Debian trixietrixie · sourcenode-handlebarsVendor fix publishedDebian records a fixed source-package version for this release.3:4.7.6+~4.1.0-2Debian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourcenode-handlebarsVendor fix publishedDebian records a fixed source-package version for this release.3:4.7.6+~4.1.0-2Debian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourcenode-handlebarsVendor fix publishedDebian records a fixed source-package version for this release.3:4.7.6+~4.1.0-2Debian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourcenode-handlebarsVendor fix publishedDebian records a fixed source-package version for this release.3:4.7.6+~4.1.0-2Debian Security Tracker ↗Source updated 6 Oct 2026
Open-source package ranges4 source-attributed ranges

These OSV and GitHub advisory ranges apply only to the named package and ecosystem. A listed fixed version is not a universal product patch or proof that an update is installed.

Ecosystem and packageAffected rangeFirst fixed versionEvidence
Mavenorg.webjars.bowergithub.wycats:handlebars.jsECOSYSTEM: introduced 0; fixed 4.7.74.7.7OSV record ↗aggregator derived · 10 Sep 2026
Mavenorg.webjars.npm:handlebarsECOSYSTEM: introduced 0; fixed 4.7.74.7.7OSV record ↗aggregator derived · 10 Sep 2026
Mavenorg.webjars:handlebarsECOSYSTEM: introduced 0; fixed 4.7.74.7.7OSV record ↗aggregator derived · 10 Sep 2026
npmhandlebarsSEMVER: introduced 0; fixed 4.7.74.7.7OSV record ↗aggregator derived · 10 Sep 2026
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2021-1052

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

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.

What

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.

Why

The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.

What

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.

Why

The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
a network path → vulnerable operation → execute code or commands in the affected security context
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
High: exploitation depends on specific conditions
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration.
CWE not yet assigned
CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CLowConfidentiality impact: A successful attack can cause a limited loss.ILowIntegrity impact: A successful attack can cause a limited loss.ALowAvailability impact: A successful attack can cause a limited loss.
Post-exploitation / living off the land
After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.
NetworkUnauthenticatedRemote code executionPublic exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-2024-0899Oracle Fusion Middleware: Mehrere Schwachstellen

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Oracle Fusion Middleware ausnutzen, um die Vertraulichkeit, Integrität und Verfügbarkeit zu gefährden.

Official advisory ↗
BSI · German · WID-SEC-2023-3032Tenable Security Nessus Network Monitor: Mehrere Schwachstellen

Ein entfernter anonymer Angreifer kann mehrere Schwachstellen in Tenable Security Nessus Network Monitor ausnutzen, um vertrauliche Informationen offenzulegen, beliebigen Code auszuführen oder Dateien zu manipulieren.

Official advisory ↗
BSI · German · WID-SEC-2022-1646Red Hat OpenShift: Mehrere Schwachstellen ermöglichen Codeausführung

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Red Hat OpenShift ausnutzen, um beliebigen Programmcode auszuführen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20210414Security Bulletin 14 Apr 2021

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 14 Apr 2021, published on 14 April 2021. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1165Multiples vulnérabilités dans les produits IBM

Record?id=CVE-2020-7656 Référence CVE CVE-2020-9480 https://www.cve.org/CVERecord?id=CVE-2020-9480 Référence CVE CVE-2020-9492 https://www.cve.org/CVERecord?id=CVE-2020-9492 Référence CVE CVE-2021-21290 https://www.cve.org/CVERecord?id=CVE-2021-21290 Référence CVE CVE-2021-21295 https://www.cve.org/CVERecord?id=CVE-2021-21295 Référence CVE CVE-2021-21409 https://www.cve.org/CVERecord?id=CVE-2021-21409 Référence CVE CVE-2021-22569 https://www.cve.org/CVERecord?id=CVE-2021-22569 Référence CVE CVE-2021-22570 https://www.cve.org/CVERecord?id=CVE-2021-22570 Référence CVE CVE-2021-23337 https://www.cve.org/CVERecord?id=CVE-2021-23337 Référence CVE CVE-2021-23369 https://www.cve.org/CVERecord?id=CVE-2021-23369 Référence CVE CVE-2021-27568 https://www.cve.org/CVERecord?id=CVE-2021-27568 Référence CVE CVE-2021-31684 https://www.cve.org/CVERecord?id=CVE-2021-31684 Référence CVE CVE-2021-33036 https://www.cve.org/CVERecord?id=CVE-2021-33036 Référence CVE CVE-2021-35515 https://www.cve.org/CVERecord?id=CVE-2021-35515 Référence CVE CVE-2021-35516 https://www.cve.org/CVERecord?id=CVE-2021-35516 Référence CVE CVE-2021-35517 https://www.cve.org/CVERecord?id=CVE-2021-35517 Référence CVE CVE-2021-36090 https://www.cve.org/CVERecord?id=CVE-2021-36090 Référence CVE CVE-2021-37136 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2024-AVI-0323Multiples vulnérabilités dans Oracle Weblogic

De multiples vulnérabilités ont été découvertes dans Oracle Weblogic. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, un déni de service à distance et une atteinte à l'intégrité des données.

Official advisory ↗
CERT-FR · French · CERTFR-2023-AVI-0986Multiples vulnérabilités dans Tenable Nessus Network Monitor

De multiples vulnérabilités ont été découvertes dans Tenable Nessus Network Monitor. Elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur.

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-278Multiples vulnérabilités dans IBM Spectrum discover

e.org/CVERecord?id=CVE-2020-15366 Référence CVE CVE-2020-1747 https://www.cve.org/CVERecord?id=CVE-2020-1747 Référence CVE CVE-2020-28498 https://www.cve.org/CVERecord?id=CVE-2020-28498 Référence CVE CVE-2020-7608 https://www.cve.org/CVERecord?id=CVE-2020-7608 Référence CVE CVE-2020-7660 https://www.cve.org/CVERecord?id=CVE-2020-7660 Référence CVE CVE-2020-7699 https://www.cve.org/CVERecord?id=CVE-2020-7699 Référence CVE CVE-2020-7720 https://www.cve.org/CVERecord?id=CVE-2020-7720 Référence CVE CVE-2020-7751 https://www.cve.org/CVERecord?id=CVE-2020-7751 Référence CVE CVE-2020-8116 https://www.cve.org/CVERecord?id=CVE-2020-8116 Référence CVE CVE-2021-23369 https://www.cve.org/CVERecord?id=CVE-2021-23369 Référence CVE CVE-2021-23383 https://www.cve.org/CVERecord?id=CVE-2021-23383 Référence CVE CVE-2021-3918 https://www.cve.org/CVERecord?id=CVE-2021-3918 Référence CVE CVE-2021-41092 https://www.cve.org/CVERecord?id=CVE-2021-41092 Référence CVE CVE-2021-43616 https://www.cve.org/CVERecord?id=CVE-2021-43616 Référence CVE CVE-2022-0122 https://www.cve.org/CVERecord?id=CVE-2022-0122 Gestion détaillée du document le 29 mars 2022 Version initiale le 04 avril 2022 ajout avis éditeur du 31 mars 2022 et CVE CVE-2021-41092 Alertes Avis Bulletins d’actualités Mentions légales Conditions générales À propos

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-1119Multiples vulnérabilités dans Tenable Nessus Network Monitor

De multiples vulnérabilités ont été découvertes dans Tenable Nessus Network Monitor. Elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, un déni de service à distance et un contournement de la politique de sécurité.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2021-005408handlebars における脆弱性

handlebars には、不特定の脆弱性が存在します。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
handlebars: unspecified < 4.7.7
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 12 Apr 2021 · Last source change 16 Sept 2024, 22:46 UTC · CWE not yet assigned

CVE recordCVE.org · 5.1
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2021-1052
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceUnavailable
NVD statusNVD modified after enrichment

Missing structured fields: CWE classification, affected product. Missing data is not evidence of low risk; review the primary advisory.

Material change intelligence

What changed after publication

View recent updates ↗

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2021-1052↗Patch or update reference↗Patch or update reference↗Public exploit reference↗Public exploit reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2021-23369 · cve.blacktree.nl