VULNERABILITY INTELLIGENCE

CVE-2021-20330

CVSS score6.5 MEDIUM

EPSS probability1.08%

CISA KEVNot currently listed

Published2021-12-15

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

Weakness classification

cna@mongodb.com: CWE-20
nvd@nist.gov: CWE-20

Primary references

cna@mongodb.com — Issue Tracking, Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Issue Tracking, Patch, Vendor Advisory