CVE-2021-20330 : An attacker with basic CRUD permissions on a replicated collection can run the applyOps command with specially malformed

An attacker with basic CRUD permissions on a replicated collection can run the applyOps command with specially malformed oplog entries, resulting in a potential denial of service on secondaries. This issue affects MongoDB Server v4.0 versions prior to 4.0.27; MongoDB Server v4.2 versions prior to 4.2.16; MongoDB Server v4.4 versions prior to 4.4.9.

Published 2021-12-15 13:15:08

Updated 2024-09-16 18:15:45

Source MongoDB, Inc.

View at NVD, CVE.org

Vulnerability category: Denial of service

Products affected by CVE-2021-20330

Mongodb » Mongodb
Versions from including (>=) 4.4.0 and before (<) 4.4.6
cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:*
Matching versions
Mongodb » Mongodb
Versions from including (>=) 4.0.0 and before (<) 4.0.25
cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:*
Matching versions
Mongodb » Mongodb
Versions from including (>=) 4.2.0 and before (<) 4.2.14
cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:*
Matching versions

Threat overview for CVE-2021-20330

Top countries where our scanners detected CVE-2021-20330

Top open port discovered on systems with this issue 27017

IPs affected by CVE-2021-20330 11,681

Threat actors abusing to this issue? Yes

Find out if you^* are affected by CVE-2021-20330!

^*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2021-20330

EPSS FAQ

0.09%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 37 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-20330

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.0	MEDIUM	AV:N/AC:L/Au:S/C:N/I:N/A:P	8.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: Single Confidentiality Impact: None Integrity Impact: None Availability Impact: Partial
6.5	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	2.8	3.6	MongoDB, Inc.
Attack Vector: Network Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High
6.5	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	2.8	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2021-20330

CWE-20 Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Assigned by:
- cna@mongodb.com (Secondary)
- nvd@nist.gov (Primary)

References for CVE-2021-20330

https://jira.mongodb.org/browse/SERVER-36263

[SERVER-36263] Bypassing operation validation in applyOps should require special privilege - MongoDB Jira
Issue Tracking;Patch;Vendor Advisory