Server log entry spoofing via newline injection
Priority LOW 27CWE-117Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
EPSS 0.013 70th percentileScored 2026-11-08
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial MongoDB Server (MongoDB Inc.): 3.6.20, 4.0.21, 4.2.10Red Hat: 2 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| MongoDB | MongoDB Server | 3.6 to before 3.6.20; 4.0 to before 4.0.21; 4.2 to before 4.2.10 | 3.6.20, 4.0.21, 4.2.10 | Patch available | CNA |
- MongoDB Server VendorMongoDB Affected 3.6 to before 3.6.20; 4.0 to before 4.0.21; 4.2 to before 4.2.10 Fixed in 3.6.20, 4.0.21, 4.2.10 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:* | 3.6.0 to before 3.6.20; 4.0.0 to before 4.0.21; 4.2.0 to before 4.2.10 | Vulnerable | MongoDB |
- cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:* Versions 3.6.0 to before 3.6.20; 4.0.0 to before 4.0.21; 4.2.0 to before 4.2.10 Vulnerable ·MongoDB
Remediation
- Fix · CNA MongoDB Server (MongoDB Inc.) Fixed in 3.6.20, 4.0.21, 4.2.10
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat OpenStack Platform 10 (Newton) | Affected | No fix planned: Out of support scope |
| Red Hat Software Collections | Affected | No fix planned: Out of support scope |
Not affected: 1 product
- Red Hat Update Infrastructure 3 for Cloud Providers
Timeline
- 2026-10-02 Threatist record created from CVE-2021-20333
- 2026-10-03 Alias added: GHSA-ghvr-mww9-3hrg
References
More Mongodb vulnerabilities
- TI-2025-13542 Zlib compressed protocol header length confusion may allow memory read KEVCVSS 4.0HIGH 8.7
- TI-2013-01669 MongoDB before 2.0.9 and 2.2.x before 2.2.4 does not properly validate requests to the… CVSS 2.0MEDIUM 6.0
- TI-2026-56639 Uncontrolled Resource Consumption in MongoDB Sharded Cluster Router Allows Unauthenticated Denial of Service CVSS 4.0HIGH 8.7
- TI-2026-56628 Reachable assertion in MongoDB Server CVSS 4.0HIGH 8.7
- TI-2026-15322 Improper Input Validation in MongoDB Aggregation Framework Allows Unauthenticated Denial of Service on mongos CVSS 4.0HIGH 8.7
- TI-2026-08537 Unbounded recursion in BSONColumn interleaved-reference causes pre-auth stack overflow CVSS 4.0HIGH 8.7
Sources
- CVE-2021-20333 · CVE Program
- CVE-2021-20333 · NVD
- FIRST EPSS
- GHSA-ghvr-mww9-3hrg · GitHub Advisory Database · CC BY 4.0
- CVE-2021-20333 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences