CVE-2021-20327
MediumCVSS 6.4Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
The mongodb-client-encryption module version 1.2.0 for Node.js does not correctly validate the KMS server's certificate. In combination with a privileged network position MITM attack, it could allow interception of traffic between the Node.js driver and the KMS service, rendering field level encryption ineffective.
Risk Assessment
Risk of exposing client-side encrypted data if an attacker can perform MITM.
Recommendation
Update the mongodb-client-encryption module to a version newer than 1.2.0 (e.g., the latest available).
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Original NVD description (English source)
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
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

