CVE-2021-3757

highpriority · track · 40EPSS 0.017 · 77 %ileEUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
1.66% (77th) EPSS
CVSS 7.5 · high
Is it mine?
17 products
Check your exposure
Who says so?
5 sources
cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

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

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • Fixedrhmtc/openshift-migration-ui-rhel8@sha256:eaa892b92aec8a199ea3b8ddde8514183cf77ea1c65bddfe4a1ef5c5c86b79cc_amd64 as a component of 8Base-RHMTC-1.5redhat_csaf

    For details on how to install and use MTC, refer to: https://docs.openshift.com/container-platform/latest/migration_toolkit_for_containers/installing-mtc.html

    https://access.redhat.com/errata/RHSA-2021:4848
02

cvss

Technical severity, 0–10. One row per scoring source.

9.8
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9
v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU
v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · security@huntr.devexploitability 3.9 · impact 3.6
v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · OSV
v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · Red Hat Product Security US
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-1321USprimaryCWE-1321USCWE-915USCWE-915US
04

affected products (17)

Products and version ranges known to be affected.

05

advisories (2)

Vendor and ecosystem advisories describing this.

  • RHSA-2021:4848Red Hat Security Advisory: Migration Toolkit for Containers (MTC) 1.5.2 security update and bugfix advisory2021-11-29csaf · redhat_csafUS

    The Migration Toolkit for Containers (MTC) 1.5.2 is now available. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

  • GHSA-c36v-fmgq-m8hxPrototype Pollution in immer2021-09-07ghsa · osvUS

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

06

also known as (3)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdnvdosvredhat_csafNVDCVE.orgMITRE
published 2021-09-02modified 2026-06-17
09

references (8)

External citations — patches, advisories, analysis.

scry

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