CVE-2023-51391
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 bug in Micrium OS Network HTTP Server permits an invalid pointer dereference during header processing - potentially allowing a device crash and Denial of Service.
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 confidenceMicrium OS Network HTTP Server contains an invalid pointer dereference vulnerability in its HTTP header processing logic. When parsing incoming HTTP requests, the server can dereference an invalid pointer during header processing, leading to a crash and denial of service.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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.
-
Identify Micrium OS HTTP Server presenceSearch system processes, firmware components, or software BOM (Bill of Materials) for 'Micrium OS' or 'Micrium' HTTP server components. If this is an embedded device, check the firmware filesystem for http_server binaries or libraries.Affected if Micrium OS Network HTTP Server is present in the environment
-
Determine HTTP server versionLocate the Micrium OS network stack or HTTP server library file and query its version metadata. Common methods: check firmware version string, library file properties, or debug console output during startup.Affected if The installed version is lower than the patched version (compare to vendor release notes when available)
-
Confirm HTTP server is enabled and listeningCheck network configuration or device management interface to verify the HTTP server service is active and bound to a port (typically 80 or 443).Affected if HTTP server is actively accepting connections
-
Inspect for crash logs or unexpected restartsReview system logs, crash dumps, or watchdog reports for signs of HTTP server crashes, especially correlate with HTTP request timing. Look for NULL pointer, invalid address, or segmentation fault messages.Affected if Crashes occur during or immediately after HTTP header parsing requests
-
Monitor for DoS conditionsTrack HTTP server uptime and availability. Check if the service becomes unavailable after receiving HTTP requests, particularly requests with unusual or malformed headers.Affected if Service becomes unavailable following incoming HTTP requests
Environment is affected if Micrium OS Network HTTP Server is present, running, and exhibits crashes during HTTP header parsing or becomes unavailable after processing requests.
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 dataApply the vendor-supplied patch when available. Until then, consider network-level mitigations such as rate limiting HTTP connections or deploying a reverse proxy/WAF in front of the device to filter malformed requests.
- Consultation4.0 h
- Implementation4.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,736.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-51391 — 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-2023-51391 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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
- No spam, self-promotion, credentials, or personal data