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Fencer Vulns
medium 6.5

CVE-2021-20326 json

Specially crafted query may result in a denial of service of mongod

published 2021-04-30 5 y ago modified 2026-09-08 2 mo ago also BIT-mongodb-2021-20326 , EUVD-2021-7749

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 61%
public exploits
0
none known

Summary

A user authorized to performing a specific type of find query may trigger a denial of service. This issue affects MongoDB Server v4.4 versions prior to 4.4.4.

Patch / fix

  • bitnami mongodb 4.4.4
  • MongoDB Inc. MongoDB Server 4.4.4

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-2021-20326 updated cvss 6.5

mongodb: Authorized user may trigger denial of service via find query

  • Red Hat OpenStack Platform 10 (Newton) mongodb, mongodb-server
    affected: no fix planned “Out of support scope”
  • Red Hat Advanced Cluster Management for Kubernetes 2 mongodb Red Hat Software Collections rh-mongodb36-mongodb, rh-mongodb36-mongodb-test, rh-mongodb36-mongodb-server, rh-mongodb36-mongodb-syspaths, rh-mongodb36-mongodb-server-syspaths Red Hat Update Infrastructure 3 for Cloud Providers mongodb
    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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.95% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:N/A:P
OSV 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami mongodb
>=4.4.0, <4.4.4
4.4.4

Affected products

  • MongoDB Inc. MongoDB Server

Classification

Weakness
  • CWE-20 Improper Input Validation
  • CWE-732 Incorrect Permission Assignment for Critical Resource
Technology feeds

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.