Specific replication command with malformed oplog entries can crash secondaries
CVE-2021-20330

6.5MEDIUM

Key Information:

Vendor
MongoDB
Status
Mongodb Server
Vendor
CVE Published:
15 December 2021

Summary

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.

Affected Version(s)

MongoDB Server 4.0 < 4.0.27

MongoDB Server 4.2 < 4.2.16

MongoDB Server 4.4 < 4.4.9

References

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

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.