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No exploitation reportedFix available

CVE-2018-20802

No exploitation reported by the sources we read.

  • Published2020-11-23
  • Fixed in4.0.3 · 3.6.9
  • WeaknessCWE-394

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 queries with compound indexes affecting QueryPlanner. This issue affects MongoDB Server v3.6 versions prior to 3.6.9 and MongoDB Server v4.0 versions prior to 4.0.3.

Timeline

dates in UTC
  1. 2020-11-2316:15CVE publishedNVD

Versions per branch

NVD
MongoDB
BranchAffectedFixed in
4.0≥ 4.0.0, < 4.0.34.0.3
3.6≥ 3.6.0, < 3.6.93.6.9

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

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • mongodbUbuntu:Pro:18.04:LTSall versions · fixed in 1:3.6.3-0ubuntu1.4+esm1

Full record on NVD

Fix

  1. Update MongoDB to 4.0.3 · 3.6.9

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.16.5known since 2026-10-23
  • NVDCVSS 3.16.5read 2026-10-23
  • NVDCVSS 2.04read 2026-10-23
  • CNAweakness (CWE)CWE-394known since 2026-10-23
  • FIRST EPSSEPSS score1.6 %2026-11-08
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

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
2020-11-23
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-g6mr-mvf4-4wvj

Frequently asked questions

What is CVE-2018-20802?

A user authorized to perform database queries may trigger denial of service by issuing specially crafted queries with compound indexes affecting QueryPlanner. This issue affects MongoDB Server v3.6 versions prior to 3.6.9 and MongoDB Server v4.0 versions prior to 4.0.3.

Is CVE-2018-20802 actively exploited?

Active exploitation of CVE-2018-20802 has not been confirmed. Its EPSS score was 1.6% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-20802?

CVE-2018-20802 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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