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Fencer Vulns
high 7.3

CVE-2021-23440 json

Prototype Pollution

published 2021-09-12 5 y ago modified 2026-06-17 4 mo ago also GHSA-4jqc-8m5r-9rpr , EUVD-2021-1976

cvss
7.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.2%
EPSS 2.2% chance of exploitation in 30 days, percentile 82%
public exploits
0
none known

Summary

This affects the package set-value before <2.0.1, >=3.0.0 <4.0.1. A type confusion vulnerability can lead to a bypass of CVE-2019-10747 when the user-provided keys used in the path parameter are arrays.

Patch / fix

  • npm set-value 2.0.1, 3.0.3, 4.0.1
  • nuget set-value-nuget 2.0.0
  • set-value_project set-value 2.0.1, 4.0.1
  • node-set-value Debian 14, Debian 13, Debian 12 3.0.1-3

debian advisories DEBIAN-CVE-2021-23440

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-23440 updated cvss 7.3

nodejs-set-value: type confusion allows bypass of CVE-2019-10747

  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/kibana6-rhel8
    affected: no fix planned “Will not fix”
  • Red Hat OpenShift Service Mesh 1 servicemesh-grafana, servicemesh-prometheus, servicemesh-grafana-prometheus
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Service Mesh 2.0 servicemesh-grafana, servicemesh-prometheus, servicemesh-grafana-prometheus
    affected: no fix available
  • Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/grc-ui-api-rhel8, rhacm2/search-api-rhel8, rhacm2/mcm-topology-rhel8, rhacm2/console-header-rhel8, rhacm2/mcm-topology-api-rhel8
    affected: no fix available, no fix planned “Will not fix”
  • Red Hat OpenShift Container Platform 3.11 kibana
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Container Platform 4 kibana, openshift4/ose-grafana, openshift4/ose-thanos-rhel9, golang-github-prometheus-prometheus
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat Openshift Container Storage 4 ocs4/mcg-core-rhel8
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift distributed tracing 2 rhosdt/jaeger-all-in-one-rhel8 Red Hat Quay 3 quay/quay-rhel8
    affected: no fix planned “Will not fix”
show 2 more
  • Red Hat RHODF 4.11 for RHEL 8 odf4/mcg-core-rhel8 v4.11.0-30
    fixed: vendor fix RHSA-2022:6156
  • Red Hat Migration Toolkit for Virtualization migration-toolkit-virtualization/mtv-ui-rhel8 Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/grc-ui-rhel8, rhacm2/console-rhel8, rhacm2/search-ui-rhel8, rhacm2/console-api-rhel8, rhacm2/application-ui-rhel8, rhacm2/kui-web-terminal-rhel8 Red Hat RHODF 4.11 for RHEL 8 odf4/cephcsi-rhel8 v4.11.0-45, odf4/odf-console-rhel8 v4.11.0-51, odf4/odf-topolvm-rhel8 v4.11.0-24, odf4/mcg-rhel8-operator v4.11.0-28, odf4/ocs-rhel8-operator v4.11.0-67, odf4/odf-rhel8-operator v4.11.0-27, +19 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.21% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • snyk.io https://snyk.io/vuln/SNYK-JS-SETVALUE-1540541 referenced PoC, tagged "exploit" by a source, unverified
  • snyk.io https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1584212 referenced PoC, tagged "exploit" by a source, unverified
  • huntr.dev https://www.huntr.dev/bounties/2eae1159-01de-4f82-a177-7478a408c4a2/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected packages

ecosystem package affected fixed in
npm set-value
>=4.0.0, <4.0.1
<2.0.1
>=3.0.0, <3.0.3
4.0.1
2.0.1
3.0.3
nuget set-value-nuget
<2.0.0
2.0.0

Affected products

  • n/a set-value

Classification

Weakness
  • CWE-843 Access of Resource Using Incompatible Type
  • CWE-1321 Improperly Controlled Modification of Object Prototype Attributes

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.