MongoDBDatabase / datastore
CVE-2019-2392
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA user authorized to perform database queries may trigger denial of service by issuing specially crafted queries, which use the $mod operator to overflow negative values. This issue affects: MongoDB Inc. MongoDB Server v4.4 versions prior to 4.4.1; v4.2 versions prior to 4.2.9; v4.0 versions prior to 4.0.20; v3.6 versions prior to 3.6.20.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceA user authorized to perform database queries can trigger denial of service by issuing specially crafted queries using the $mod operator with negative values that cause an integer overflow, crashing the MongoDB Server process. This affects MongoDB Server versions v4.4 prior to 4.4.1, v4.2 prior to 4.2.9, v4.0 prior to 4.0.20, and v3.6 prior to 3.6.20.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
MongoDBDatabase / datastore
>= 3.6.0, < 3.6.20>= 4.0.0, < 4.0.20>= 4.2.0, < 4.2.9>= 4.4.0, < 4.4.1CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check MongoDB server versionRun `db.version()` in the mongo shell or execute `mongod --version` from the command lineAffected if The version falls within these ranges: 3.6.0-3.6.19, 4.0.0-4.0.19, 4.2.0-4.2.8, or 4.4.0-4.4.0
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Identify users with database query permissionsRun `db.system.users.find()` in the admin or target database to list all users, or use `db.getRoles()` to review role definitionsAffected if Any user exists who has permissions to run aggregation or query operations against database collections
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Confirm $mod operator is accessibleThe $mod operator is a standard aggregation expression operator and is enabled by default for any user with query/aggregation permissions; verify by testing with a read-only user: `db.collection.aggregate([{ $project: { result: { $mod: [-1, 1] } } }])`Affected if The command executes without error, indicating the $mod operator is available to the querying user
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Audit query permission scopeReview which databases and collections each user can access using `db.getUsers()` or by inspecting role privileges with `db.getRole(rolename, {showPrivileges: true})`Affected if Users with broad query access exist on unpatched MongoDB versions
You are affected if your MongoDB server version is 3.6.0-3.6.19, 4.0.0-4.0.19, 4.2.0-4.2.8, or 4.4.0-4.4.0 AND untrusted users have database query permissions that allow use of the $mod operator.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor data3.6.204.0.204.2.9
Upgrade MongoDB Server to version 4.4.1, 4.2.9, 4.0.20, 3.6.20 or later. Until upgraded, limit database query permissions to trusted users only.
Fix this in MongoDB
Scoped from the published advisory
- Consultation3.0 h
- Implementation3.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-2392 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2019-2392 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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