CVE-2024-42390
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 · uneditedUse of Out-of-range Pointer Offset vulnerability in Cesanta Mongoose Web Server v7.14 allows an attacker to send an unexpected TLS packet and force the application to read unintended heap memory space.
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 · moderate confidenceHeap memory information disclosure vulnerability in Cesanta Mongoose Web Server v7.14's TLS packet handling. An attacker can send a malformed TLS packet that causes the server to read from an out-of-bounds pointer offset, leaking heap memory contents to the attacker.
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<= 7.14CVSS 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
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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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Confirm Cesanta Mongoose installationIdentify if the running web server is Cesanta Mongoose. Check process information, binary metadata, or library names linking to 'mongoose'. If building from source, review the software bill of materials or build configuration.Affected if The software is Cesanta Mongoose Web Server
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Determine installed Mongoose versionRun the server with a version flag (e.g., --version, -v) if available, or inspect the binary/library metadata. Compare the version number to the affected range.Affected if The installed version is 7.14 or any earlier version ( <= 7.14 )
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Verify TLS/SSL is enabledInspect the server configuration or runtime settings for TLS/SSL module activation. Check for mg_enable_ssl, mg_tls_init, or similar TLS-related function calls in configuration files or code.Affected if TLS support is enabled and the server accepts TLS connections
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Confirm TLS packet processing is activeReview network listener configuration to confirm the server is configured to process incoming TLS packets on any port. This may be evident from config files, command-line flags, or API calls binding to TLS ports (typically 443 or custom TLS ports).Affected if The server is actively accepting and processing TLS connections
The environment is affected if Cesanta Mongoose version 7.14 or earlier is in use AND TLS support is enabled, allowing malformed TLS packets to trigger heap memory disclosure.
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 dataUpgrade to a patched version if available; otherwise, implement strict bounds checking and validation on TLS packet parsing routines to prevent out-of-range pointer arithmetic.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-42390 — 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-2024-42390 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
- No weaponised exploit code, or anything meant to cause harm
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