CVE-2021-20333: MongoDB

Medium severity, CVSS 5.3. EPSS: 1.3% chance of exploitation in the next 30 days.

Sending specially crafted commands to a MongoDB Server may result in artificial log entries being generated or for log entries to be split. This issue affects MongoDB Server v3.6 versions prior to 3.6.20; MongoDB Server v4.0 versions prior to 4.0.21 and MongoDB Server v4.2 versions prior to 4.2.10.

Affected products

• MongoDB MongoDB: from 3.6.0, before 3.6.20 (fixed in 3.6.20); from 4.0.0, before 4.0.21 (fixed in 4.0.21); from 4.2.0, before 4.2.10 (fixed in 4.2.10)

Published 2021-07-23. Last modified 2026-06-17.