What is CVE-2021-20328?

CVE-2021-20328 is a medium-severity vulnerability in Mongodb Java Driver, classified under Improper Certificate Validation. CVSS score: 6.4/10. Published 2021-02-25.

How severe is CVE-2021-20328?

Medium severity. CVSS v3 base score is 6.4 out of 10.

Is CVE-2021-20328 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Mongodb Java Driver

CVE-2021-20328

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.

Vulnerability class: Improper Certificate Validation

EPSS: 0.004 (35.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.

Affected products

Mongodb Java_driver
Mongodb Inc. Mongodb-driver — versions 3.11, 3.12
Mongodb Inc. Mongodb-driver-legacy — versions 4.2.0, 3.11, 3.12
Mongodb Inc. Mongodb-driver-sync — versions 4.2.0, 3.11, 3.12
Mongodb Inc. Mongo-java-driver — versions 3.11, 3.12
Quarkus — versions 1.13.3

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

cna@mongodb.com (Patch, x_refsource_MISC, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2021-20328?: CVE-2021-20328 is a medium-severity vulnerability in Mongodb Java Driver, classified under Improper Certificate Validation. CVSS score: 6.4/10. Published 2021-02-25.
How severe is CVE-2021-20328?: Medium severity. CVSS v3 base score is 6.4 out of 10.
Is CVE-2021-20328 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.