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Fencer Vulns
medium 6.4

CVE-2021-20328 json

MongoDB Java driver client-side field level encryption not verifying KMS host name

published 2021-02-25 5 y ago modified 2026-06-17 4 mo ago also GHSA-rghw-6px2-fgwc , EUVD-2022-5169

cvss
6.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits
0
none known

Summary

Specific versions of the Java driver that support client-side field level encryption (CSFLE) fail to perform correct host name verification on the KMS server’s certificate. This vulnerability in combination with a privileged network position active MITM attack could result in interception of traffic between the Java driver and the KMS service rendering Field Level Encryption ineffective. This issue was discovered during internal testing and affects all versions of the Java driver that support CSFLE. The Java async, Scala, and reactive streams drivers are not impacted. This vulnerability does not impact driver traffic payloads with CSFLE-supported key services originating from applications residing inside the AWS, GCP, and Azure network fabrics due to compensating controls in these environments. This issue does not impact driver workloads that don’t use Field Level Encryption.

Patch / fix

  • maven org.mongodb:mongodb-driver 3.11.3, 3.12.8
  • maven org.mongodb:mongodb-driver-sync 3.11.3, 3.12.8, 4.0.6, 4.1.2, 4.2.1
  • maven org.mongodb:mongo-java-driver 3.11.3, 3.12.8
  • maven org.mongodb:mongodb-driver-legacy 3.11.3, 3.12.8, 4.0.6, 4.1.2, 4.2.1
  • mongodb java_driver 3.11.3, 3.12.8, 4.0.6, 4.1.2, 4.2.1
  • quarkus quarkus 1.13.3

Vendor advisories

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

cisa ICSA-26-218-01 updated cvss 6.8

ABB Ability Zenon

  • ABB Ability Zenon /all IIoT services with MongoDB 4.2
    affected: mitigation

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

red hat product security vex CVE-2021-20328 updated cvss 6.4

mongo-java-driver: client-side field level encryption not verifying KMS host name

  • Red Hat A-MQ Clients 2 mongodb-driver mongodb-driver
    affected: no fix planned “Will not fix”
  • Red Hat build of Debezium 1 mongodb-driver mongodb-driver Red Hat Integration Camel Quarkus 1 mongodb-driver mongodb-driver
    affected: no fix available
  • Red Hat Integration
    fixed: vendor fix RHSA-2021:4918
  • Red Hat Integration Camel Quarkus 2
    fixed: vendor fix RHSA-2021:4767
  • Red Hat Integration Debezium 1.4.2
    fixed: vendor fix RHSA-2021:0871
  • Red Hat Fuse 7 mongo-java-driver mongo-java-driver Red Hat JBoss Data Virtualization 6 mongo-java-driver mongo-java-driver Red Hat JBoss Enterprise Application Platform 7 mongo-java-driver mongo-java-driver Red Hat JBoss Fuse 6 mongo-java-driver mongo-java-driver Red Hat OpenShift Container Platform 4 openshift4/ose-metering-presto Red Hat Software Collections rh-mongodb36-mongo-java-driver, rh-mongodb36-mongo-java-driver-bson, rh-mongodb36-mongo-java-driver-driver, rh-mongodb36-mongo-java-driver-javadoc, rh-mongodb36-mongo-java-driver-driver-core, rh-mongodb36-mongo-java-driver-driver-async
    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
total
Assessed
2 y ago

Exploit prediction

0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.4 CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
NVD 3.1 6.8 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD 2.0 4.3 AV:A/AC:M/Au:N/C:P/I:P/A:N
GitHub 3.1 6.8 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
maven org.mongodb:mongodb-driver
>=3.11.0, <3.11.3
>=3.12.0, <3.12.8
3.11.3
3.12.8
maven org.mongodb:mongodb-driver-sync
>=4.0.0, <4.0.6
>=4.1.0, <4.1.2
>=4.2.0, <4.2.1
>=3.12.0, <3.12.8
>=3.11.0, <3.11.3
4.0.6
4.1.2
4.2.1
3.12.8
3.11.3
maven org.mongodb:mongo-java-driver
>=3.11.0, <3.11.3
>=3.12.0, <3.12.8
3.11.3
3.12.8
maven org.mongodb:mongodb-driver-legacy
>=4.0.0, <4.0.6
>=4.1.0, <4.1.2
>=3.11.0, <3.11.3
>=3.12.0, <3.12.8
>=4.2.0, <4.2.1
4.0.6
4.1.2
3.11.3
3.12.8
4.2.1

Affected products

  • MongoDB Inc. mongo-java-driver
  • MongoDB Inc. mongodb-driver
  • MongoDB Inc. mongodb-driver-sync
  • MongoDB Inc. mongodb-driver-legacy
  • mongodb java_driver

Classification

Weakness
  • CWE-295 Improper Certificate Validation

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.