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CVE-2020-7929

Specially crafted regex query can cause DoS

MEDIUM
6.5
CVSS Score
Published: March 1, 2021 at 04:05 PM UTC
Updated: June 17, 2026 at 03:25 AM UTC
1 product affected across 1 vendorMongoDB

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Severity
MEDIUM6.5
Exploit prediction
EPSS 1%
SSVC
No known exploit

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.

Affected

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

MongoDB· MongoDB
95%
3.6 ≤ v < 3.6.213.6.0 ≤ v < 3.6.214.0 ≤ v < 4.0.204.0.0 ≤ v < 4.0.203.64.0
Affected range stops below 3.6.21, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.0.20, 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

References (1)

x_refsource_MISCIssue TrackingPatchVendor Advisory
Source: [email protected]
https://jira.mongodb.org/browse/SERVER-51083

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

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-185NVD-CWE-Other

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