CVE-2024-42386
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 produce a segmentation fault on the application.
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 confidenceAn out-of-range pointer offset vulnerability in Cesanta Mongoose Web Server v7.14 allows remote attackers to trigger a segmentation fault by sending malformed TLS packets. The vulnerability exists in the TLS packet handling code where pointer arithmetic results in an out-of-bounds memory access, leading to denial of service.
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
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/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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Identify Mongoose Web Server versionLocate the Mongoose library or binary in your deployment. Check the version string in your application dependencies (such as package.json, go.mod, or the compiled library filename). Compare the version to the affected range.Affected if The installed version of Cesanta Mongoose is 7.14 or lower.
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Confirm TLS/SSL is enabledReview your Mongoose server initialization code or configuration files. Look for TLS-specific functions such as mg_enable_tls, mg_listen with TLS options, or SSL/TLS-related flags being set.Affected if TLS or SSL functionality is enabled in your Mongoose server configuration.
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Verify network exposure of TLS endpointDetermine if your Mongoose server with TLS is directly accessible from network sources. Check firewall rules, networkACLs, or service bindings that allow external connections to the TLS port.Affected if The Mongoose TLS endpoint is exposed to untrusted or public networks.
You are affected if you are running Cesanta Mongoose version 7.14 or lower with TLS enabled and the TLS service is reachable by remote attackers who can send packets to your server.
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 of Mongoose Web Server that addresses the pointer offset bounds checking in TLS packet processing. If no patched version is available, consider implementing TLS traffic filtering at the network perimeter to reject malformed packets.
- Consultation2.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-42386 — 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-2024-42386 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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