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6.4Medium

Mongodb Mongodb Client Encryption

CVE-2021-20327

A specific version of the Node.js mongodb-client-encryption module does not perform correct validation of 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 Node.js driver and the KMS service rendering client-side field level encryption (CSFLE) ineffective. This issue was discovered during internal testing and affects mongodb-client-encryption module version 1.2.0, which was available from 2021-Jan-29 and deprecated in the NPM Registry on 2021-Feb-04. This vulnerability does not impact driver traffic payloads with CSFLE-supported key services from applications residing inside the AWS, GCP, and Azure nework fabrics due to compensating controls in these environments. This issue does not impact driver workloads that don’t use Field Level Encryption. This issue affect MongoDB Node.js Driver mongodb-client-encryption module version 1.2.0

What this means for your business

  • It affects Mongodb Client Encryption. It matters if your company, or a supplier that handles your data, runs it.
  • An attacker can use it from inside the same network, without a login, but only after tricking someone into an action such as opening a file or a link.
  • FIRST's prediction model gives it a 0.2% chance of attack attempts being seen in the next 30 days, ranking above 10% of all known flaws.

What to do

  1. 1Check whether your company or your suppliers run Mongodb Client Encryption, and which version. The affected versions are listed further down this page.
  2. 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.

Not sure if your company is exposed?

Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.

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Scoring

CVSS
6.4 (v3.1)
Vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Weakness
CWE-295
Assigned by
cna@mongodb.com

Dates

Published
2021-02-25
Last modified
2026-09-17
Sources
NVD

Affected products

  • Mongodb Mongodb Client Encryption1.2.0

As listed in the NVD configuration data. Not a statement about your estate.

References