CVE-2018-20802

Post-auth queries on compound index may crash mongod

MEDIUM

6.5

CVSS Score

Published: November 23, 2020 at 03:15 PM UTC

Updated: June 17, 2026 at 01:53 AM UTC

1 product affected across 1 vendorMongoDB

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Severity

MEDIUM6.5

Exploit prediction

EPSS 2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

MongoDB · MongoDB

95%

3.6 ≤ v < 3.6.93.6.0 ≤ v < 3.6.94.0 ≤ v < 4.0.34.0.0 ≤ v < 4.0.33.6 4.0

Affected range stops below 3.6.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.0.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://jira.mongodb.org/browse/SERVER-36993

References (1)

x_refsource_CONFIRMIssue TrackingVendor Advisory

Source: [email protected]

https://jira.mongodb.org/browse/SERVER-36993

CVSS

6.5MEDIUMmongodb

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-394NVD-CWE-Other

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