Description
An attacker with basic CRUD permissions on a replicated collection can run the applyOps command with specially malformed oplog entries, resulting in a potential denial of service on secondaries. This issue affects MongoDB Server v4.0 versions prior to 4.0.27; MongoDB Server v4.2 versions prior to 4.2.16; MongoDB Server v4.4 versions prior to 4.4.9.
Published: 2021-12-15
Score: 6.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
EUVD EUVD EUVD-2021-7750 An attacker with basic CRUD permissions on a replicated collection can run the applyOps command with specially malformed oplog entries, resulting in a potential denial of service on secondaries. This issue affects MongoDB Server v4.0 versions prior to 4.0.27; MongoDB Server v4.2 versions prior to 4.2.16; MongoDB Server v4.4 versions prior to 4.4.9.
History

Wed, 25 Feb 2026 10:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 16 Sep 2024 17:30:00 +0000

Type Values Removed Values Added
Description An attacker with basic CRUD permissions on a replicated collection can run the applyOps command with specially malformed oplog entries, resulting in a potential denial of service on secondaries. This issue affects MongoDB Server v4.0 versions prior to 4.0.27; MongoDB Server v4.2 versions prior to 4.2.16; MongoDB Server v4.4 versions prior to 4.4.9. An attacker with basic CRUD permissions on a replicated collection can run the applyOps command with specially malformed oplog entries, resulting in a potential denial of service on secondaries. This issue affects MongoDB Server v4.0 versions prior to 4.0.27; MongoDB Server v4.2 versions prior to 4.2.16; MongoDB Server v4.4 versions prior to 4.4.9.

cve-icon MITRE

Status: PUBLISHED

Assigner: mongodb

Published:

Updated: 2024-09-16T17:23:58.888Z

Reserved: 2020-12-17T00:00:00.000Z

Link: CVE-2021-20330

cve-icon Vulnrichment

Updated: 2024-08-03T17:37:23.911Z

cve-icon NVD

Status : Modified

Published: 2021-12-15T13:15:07.633

Modified: 2024-11-21T05:46:23.563

Link: CVE-2021-20330

cve-icon Redhat

Severity : Moderate

Publid Date: 2021-12-15T00:00:00Z

Links: CVE-2021-20330 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses