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No exploitation reportedFix available

CVE-2021-3757

No exploitation reported by the sources we read.

  • Published2021-09-02
  • Fixed in9.0.6
  • WeaknessCWE-1321

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

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

Timeline

dates in UTC
  1. 2021-09-0212:15CVE publishedNVD

Versions per branch

OSV · NVD
immer
BranchAffectedFixed in
9.0≥ 7.0.0, < 9.0.69.0.6
Immer project immer
BranchAffectedFixed in
9.0≤ 9.0.5no fix published

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.

Packages

  • @rootio/immerRoot:npmall versions · fixed in 8.0.1-root.io.2
  • immerTuxCare:npmfrom 8.0.1-tuxcare.0 · fixed in 8.0.1-tuxcare.1
  • immerRoot:npmall versions · fixed in 8.0.1-aikido.2

Vendor advisories

  • CVE-2021-3757 Red Hat Product Security1 product fixed · 16 known affected

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

    servicemesh-grafana as a component of OpenShift Service Mesh 1 · servicemesh-grafana-prometheus as a component of OpenShift Service Mesh 1 · servicemesh-grafana.src as a component of OpenShift Service Mesh 1 · +13 more

  • RHSA-2021:4848 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Migration Toolkit for Containers (MTC) 1.5.2 security update and bugfix advisory

Full record on NVD

Fix

  1. Update immer to 9.0.6
  2. Vendor fix Red Hat Product Security RHSA-2021:4848 · 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
  3. No fix available, says the vendor Red Hat Product Security CVE-2021-3757 · 3 productsFix deferred
  4. No fix available, says the vendor Red Hat Product Security CVE-2021-3757 · 8 productsAffected
  5. No fix planned, says the vendor Red Hat Product Security CVE-2021-3757 · 5 productsOut of support scope

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.19.8read 2026-10-23
  • CNACVSS 3.07.5known since 2026-10-23
  • NVDCVSS 2.07.5read 2026-10-23
  • CNAweakness (CWE)CWE-1321known since 2026-10-23
  • NVDweakness (CWE)CWE-1321read 2026-10-23
  • FIRST EPSSEPSS score1.7 %2026-11-09
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2021-09-03

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2021-09-02
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-c36v-fmgq-m8hx

Frequently asked questions

What is CVE-2021-3757?

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

Is CVE-2021-3757 actively exploited?

Active exploitation of CVE-2021-3757 has not been confirmed. Its EPSS score was 1.7% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-3757?

CVE-2021-3757 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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