CVE-2018-20803: MongoDB

Medium severity, CVSS 6.5. EPSS: 1.4% chance of exploitation in the next 30 days.

A user authorized to perform database queries may trigger denial of service by issuing specially crafted queries, which loop indefinitely in mathematics processing while retaining locks. This issue affects MongoDB Server v4.0 versions prior to 4.0.5; MongoDB Server v3.6 versions prior to 3.6.10 and MongoDB Server v3.4 versions prior to 3.4.19.

Affected products

• MongoDB MongoDB: from 3.4.0, before 3.4.19 (fixed in 3.4.19); from 3.6.0, before 3.6.10 (fixed in 3.6.10); from 4.0.0, before 4.0.5 (fixed in 4.0.5)

Published 2020-11-23. Last modified 2026-06-17.