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Fencer Vulns
high 7.5

CVE-2021-3757 json

Prototype Pollution in immerjs/immer

published 2021-09-02 5 y ago modified 2026-06-17 4 mo ago also GHSA-c36v-fmgq-m8hx , EUVD-2021-2031

cvss
7.5
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 76%
public exploits
0
none known

Summary

immer is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Patch / fix

  • npm immer 9.0.6

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-2021-3757 updated cvss 7.5

nodejs-immer: prototype pollution may lead to DoS or remote code execution

  • 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 Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/console-rhel8, rhacm2/search-ui-rhel8, rhacm2/kui-web-terminal-rhel8
    affected: no fix available
  • Red Hat OpenShift Container Platform 4 openshift4/ose-grafana, openshift4/ose-prometheus, openshift4/ose-thanos-rhel8
    affected: no fix available “Fix deferred”
  • Red Hat Migration Toolkit 1.5 rhmtc/openshift-migration-ui-rhel8 v1.5.2-6
    fixed: vendor fix RHSA-2021:4848
  • Red Hat Migration Toolkit 1.5 rhmtc/openshift-velero-plugin-rhel8 v1.5.2-3, rhmtc/openshift-migration-velero-rhel8 v1.5.2-4, rhmtc/openshift-migration-registry-rhel8 v1.5.2-4, rhmtc/openshift-migration-controller-rhel8 v1.5.2-6, rhmtc/openshift-migration-log-reader-rhel8 v1.5.2-4, rhmtc/openshift-migration-operator-bundle v1.5.2-15, +7 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

1.66% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • huntr.dev https://huntr.dev/bounties/23d38099-71cd-42ed-a77a-71e68094adfa referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
npm immer
>=7.0.0, <9.0.6
9.0.6

Affected products

  • immerjs immerjs/immer

Classification

Weakness
  • CWE-1321 Improperly Controlled Modification of Object Prototype Attributes
  • CWE-915 Improperly Controlled Modification of Dynamically-Determined Object 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.