CVE-2021-20333 Server log entry spoofing via newline injection
Attackers can spoof or split server log entries by sending crafted commands, compromising audit integrity in MongoDB Server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-20333?
CVE-2021-20333 is a medium-severity vulnerability in Mongodb Mongodb, published on 23 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Sending specially crafted commands to a MongoDB Server may result in artificial log entries being generated or for log entries to be split. This issue affects MongoDB Server v3.6 versions prior to 3.6.20; MongoDB Server v4.0 versions prior to 4.0.21 and MongoDB Server v4.2 versions prior to 4.2.10.
Which versions are affected by CVE-2021-20333?
1 open source package ship an affected version, including mongodb. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mongodb Bitnami | From 3.6.0 | 3.6.20, 4.0.21, 4.2.10 |
Products include Mongodb Mongodb.
How do I fix CVE-2021-20333?
Upgrade mongodb to a fixed version for your release line: 3.6.20, 4.0.21 or 4.2.10.
Is CVE-2021-20333 being exploited?
There is no known exploitation of CVE-2021-20333 in the wild and no public exploit code.
Other vulnerabilities in Mongodb Mongodb
- CVE-2025-14847 MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency
- CVE-2026-82067 Auth bypass in MongoDB Server
- CVE-2026-13072 MongoDB Improper Input Validation in Compute Mode External Data Processing Leading to Memory Corruption
- CVE-2017-15535 Denial of service in n/a
- CVE-2026-18691 Improper Authentication in MongoDB Intra-Cluster Connections Allows Credential Exposure
Sources
Also known as BIT-mongodb-2021-20333, GHSA-ghvr-mww9-3hrg, UBUNTU-CVE-2021-20333.