Exploitation reportedNot in CISA KEV yetFix available

CVE-2021-23337

Q: Is CVE-2021-23337 actively exploited?

Active exploitation of CVE-2021-23337 has not been confirmed. Its EPSS score was 21.3% on 2026-10-25, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-23337?

CVE-2021-23337 has a CVSS v3 base score of 7.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

Exploitation reported by one source. First attested on 2026-10-23 by GCVE · shadowserver.

Published2021-02-15
Fixed in4.17.21
WeaknessCWE-94

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Lodash versions prior to 4.17.21 are vulnerable to Command Injection via the template function.

Timeline

dates in UTC

2021-02-1513:15CVE publishedNVD
2026-10-2320:46Listed as exploited by GCVEGCVE
2026-10-2320:46Exploitation first reportedGCVE

Observed activity

isMalicious corpus · updated 2026-10-26 03:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-23337?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-23337?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Lodash

Branch	Affected	Fixed in	Source
4.17	< 4.17.21	4.17.21	NVD · OSV

Oracle primavera gateway

Branch	Affected	Fixed in	Source
17.12	≥ 17.12.0, ≤ 17.12.11	no fix published	NVD
18.8	≥ 18.8.0, ≤ 18.8.12	no fix published	NVD
19.12	≥ 19.12.0, ≤ 19.12.11	no fix published	NVD
20.12	≥ 20.12.0, ≤ 20.12.7	no fix published	NVD

Oracle primavera unifier

Branch	Affected	Fixed in	Source
17.x	≥ 17.7, ≤ 17.12	no fix published	NVD
18.8	= 18.8	no fix published	NVD
19.12	= 19.12	no fix published	NVD
20.12	= 20.12	no fix published	NVD

23 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

CVE-2021-23337 Red Hat Product Security27 products fixed · 22 known affected
nodejs-lodash: command injection via template
kiali as a component of OpenShift Service Mesh 2.0 · kiali.src as a component of OpenShift Service Mesh 2.0 · servicemesh-grafana as a component of OpenShift Service Mesh 2.0 · +19 more
RHSA-2026:7329 Red Hat Product Security2 products fixed
Red Hat Security Advisory: A Subscription Management tool for finding and reporting Red Hat product usage
RHSA-2022:6429 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Migration Toolkit for Containers (MTC) 1.7.4 security and bug fix update
ICSA-22-258-05 CISA1 known affected
Siemens SINEC INS
SINEC INS
SSA-637483 Siemens ProductCERT1 known affected
SSA-637483 Third-Party Component Vulnerabilities in SINEC INS before V1.0 SP2
SINEC INS
RHSA-2021:3459 Red Hat Product Security2 products fixed
Red Hat Security Advisory: Red Hat Virtualization Host security and bug fix update [ovirt-4.4.8]

4 more advisories

Full record on NVD

Fix

Update Lodash to 4.17.21
Vendor fix Red Hat Product Security RHSA-2026:7329 · 2 productsThe containers required to run Discovery can be installed through discovery-installer RPM. See the official documentation for more details.
Vendor fix Red Hat Product Security RHSA-2022:6429 · 1 productFor details on how to install and use MTC, refer to: https://docs.openshift.com/container-platform/latest/migration_toolkit_for_containers/installing-mtc.html
Vendor fix CISA ICSA-22-258-05 · 1 productUpdate to V1.0 SP2 or later version
Vendor fix Siemens ProductCERT SSA-637483 · 1 productUpdate to V1.0 SP2 or later version
Vendor fix Red Hat Product Security RHSA-2021:3459 · 2 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/2974891
Vendor fix Red Hat Product Security RHSA-2021:2438 · 12 productsFor OpenShift Container Platform 4.8 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.8/release_notes/ocp-4-8-r…

Advisories and patches

Detection

read 2026-10-25 23:12 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedkhayashi4337/lodash.template-fixed

Sources

GCVEexploitation2026-10-23
CISA-ADPSSVC decisionnone2026-10-08
OpenCVESSVC decisionnone—
CNACVSS 3.17.2read 2026-10-23
NVDCVSS 3.17.2read 2026-10-23
NVDCVSS 2.06.5read 2026-10-23
NVDweakness (CWE)CWE-94read 2026-10-23
FIRST EPSSEPSS score21.3 %read 2026-10-25
PoC-in-GitHubproof of concept1read 2026-10-25
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Published: 2021-02-15
Last Modified: 2026-10-08
NVD status: Modified

Frequently asked questions

What is CVE-2021-23337?

Lodash versions prior to 4.17.21 are vulnerable to Command Injection via the template function.

Is CVE-2021-23337 actively exploited?

Active exploitation of CVE-2021-23337 has not been confirmed. Its EPSS score was 21.3% on 2026-10-25, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-23337?

CVE-2021-23337 has a CVSS v3 base score of 7.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

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