VULNERABILITY INTELLIGENCE

CVE-2021-20328

CVSS score6.4 MEDIUM
EPSS probability0.44%
CISA KEVNot currently listed
Published2021-02-25
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Description

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.

Weakness classification

  • cna@mongodb.com: CWE-295
  • nvd@nist.gov: CWE-295

Primary references