What is CVE-2020-7929?

CVE-2020-7929 is a medium-severity vulnerability in MongoDB, classified under Incorrect Regular Expression. CVSS score: 6.5/10. Published 2021-03-01.

How severe is CVE-2020-7929?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in MongoDB

CVE-2020-7929

A user authorized to perform database queries may trigger denial of service by issuing specially crafted query contain a type of regex. This issue affects MongoDB Server v3.6 versions prior to 3.6.21 and MongoDB Server v4.0 versions prior to 4.0.20.

Published 2021-03-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.013 (70.0th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: +0.000

Affected products

MongoDB
MongoDB Inc. Server — versions 3.6, 4.0

Weakness classification (CWE)

CWE-185 — Incorrect Regular Expression

References

jira.mongodb.org/browse/SERVER-51083 (Patch, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2020-7929?: CVE-2020-7929 is a medium-severity vulnerability in MongoDB, classified under Incorrect Regular Expression. CVSS score: 6.5/10. Published 2021-03-01.
How severe is CVE-2020-7929?: Medium severity. CVSS v3 base score is 6.5 out of 10.