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MongoDB Node.js client side field level encryption library may not be validating KMS certificate

CVSS 3.1 6.4 MEDIUMEUVD CVSS 3.1 6.4 CVSS 3.1 · [email protected] · Secondary 6.4 MEDIUMCVSS 3.1 · [email protected] · Primary 6.8 MEDIUMCVSS 2.0 · [email protected] · Primary 4.3 MEDIUMCVSS_V3 Publisher rating MODERATEFixed by mongodb-client-encryption 1.2.1KEV status unknown

cve-program · CVE-2021-20327

Published

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

Read the publisher's advisory

euvd · EUVD-2021-0871

Published

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

Read the publisher's advisory

nvd · CVE-2021-20327

Published

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

Read the publisher's advisory

osv · GHSA-rjmf-p882-645m

Published

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

Read the publisher's advisory

Affected versions, risk and source history

Exploitation and risk

Source status

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Risk history

Compare earlier KEV listings and daily EPSS scores. Advisory wording and affected versions have a separate history.

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Advisory history

12 saved versions

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11 Nov 2026 22:06:23 UTC

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 …

euvd · EUVD-2021-0871 · Published

9 Nov 2026 21:13:47 UTC

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 …

euvd · EUVD-2021-0871 · Published

7 Nov 2026 20:16:14 UTC

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 …

euvd · EUVD-2021-0871 · Published

5 Nov 2026 19:45:45 UTC

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 …

euvd · EUVD-2021-0871 · Published

3 Nov 2026 19:08:52 UTC

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 …

euvd · EUVD-2021-0871 · Published

1 Nov 2026 18:05:57 UTC

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 …

euvd · EUVD-2021-0871 · Published

30 Oct 2026 17:50:56 UTC

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 …

euvd · EUVD-2021-0871 · Published

28 Oct 2026 14:50:50 UTC

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 …

euvd · EUVD-2021-0871 · Published

24 Oct 2026 18:21:55 UTC

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 …

euvd · EUVD-2021-0871 · Published

24 Oct 2026 17:17:33 UTC

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 …

nvd · CVE-2021-20327 · Published

24 Oct 2026 13:17:17 UTC

mongodb-client-encryption vulnerable to Improper Certificate Validation

osv · GHSA-rjmf-p882-645m · Published

23 Oct 2026 15:48:27 UTC

MongoDB Node.js client side field level encryption library may not be validating KMS certificate

cve-program · CVE-2021-20327 · Published

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 13 Nov 14:14 UTC · 274 of 275 readable · 273 fully read · documentation 469/469 current