No exploitation reportedFix available

CVE-2020-7929

Q: Is CVE-2020-7929 actively exploited?

Active exploitation of CVE-2020-7929 has not been confirmed. Its EPSS score was 1.3% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2020-7929?

CVE-2020-7929 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2021-03-01
Fixed in4.0.20 · 3.6.21
WeaknessCWE-185

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2021-03-0116:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-7929?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-7929?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV · CISA-ADP

MongoDB

Branch	Affected	Fixed in	Source
4.0	≥ 4.0.0, < 4.0.20	4.0.20	NVD · OSV
4.0	≥ 4.0, < 4.0.20	4.0.20	CISA-ADP
3.6	≥ 3.6.0, < 3.6.21	3.6.21	NVD · OSV
3.6	≥ 3.6, < 3.6.21	3.6.21	CISA-ADP

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update MongoDB to 4.0.20 · 3.6.21

Advisories and patches

jira.mongodb.orgPatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2024-01-23
OpenCVESSVC decisionnone—
CNACVSS 3.16.5read 2026-10-23
NVDCVSS 3.16.5read 2026-10-23
NVDCVSS 2.04read 2026-10-23
CNAweakness (CWE)CWE-185read 2026-10-23
FIRST EPSSEPSS score1.3 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published: 2021-03-01
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-7929?

Is CVE-2020-7929 actively exploited?

Active exploitation of CVE-2020-7929 has not been confirmed. Its EPSS score was 1.3% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-7929?

CVE-2020-7929 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

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