CVE-2021-20333
No exploitation reported by the sources we read.
- Published2021-07-23
- Fixed in4.2.10 · 4.0.21 · 3.6.20
- WeaknessCWE-116 · CWE-117
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTC- 2021-07-2312:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-20333?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-20333?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD · OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 4.2 | ≥ 4.2.0, < 4.2.10 | 4.2.10 | NVD · OSV |
| 4.0 | ≥ 4.0.0, < 4.0.21 | 4.0.21 | NVD · OSV |
| 3.6 | ≥ 3.6.0, < 3.6.20 | 3.6.20 | NVD · OSV |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
mongodb: server log entry spoofing via newline injection
mongodb as a component of Red Hat OpenStack Platform 10 (Newton) · mongodb-server as a component of Red Hat OpenStack Platform 10 (Newton) · rh-mongodb36-mongodb as a component of Red Hat Software Collections · +4 more
ABB Ability Zenon
IIoT services with MongoDB 4.2 installed on ABB Ability Zenon /all
Fix
- Update MongoDB to 4.2.10 · 4.0.21 · 3.6.20
- Mitigation from the vendor CISA ICSA-26-218-01 · 1 productABB recommends the following mitigation measures: - Replace bundled MongoDB with a supported version if IIoT services are required: - Where IIoT functionality is required, the bundled MongoDB instance can be replaced with a supported and patched version through manual configuration. - The follo…
- No fix planned, says the vendor Red Hat Product Security CVE-2021-20333 · 7 productsOut of support scope
Advisories and patches
- jira.mongodb.orgPatch · Vendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Published
- 2021-07-23
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2021-20333?
Is CVE-2021-20333 actively exploited?
What is the CVSS score for CVE-2021-20333?
Running MongoDB? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Go further
- Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.