CVE-2023-48696
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 · uneditedAzure RTOS USBX is a USB host, device, and on-the-go (OTG) embedded stack, that is fully integrated with Azure RTOS ThreadX. An attacker can cause remote code execution due to expired pointer dereference vulnerabilities in Azure RTOS USBX. The affected components include components in host class, related to CDC ACM in RTOS v6.2.1 and below. The fixes have been included in USBX release 6.3.0. Users are advised to upgrade. There are no known workarounds for this vulnerability.
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 confidenceAzure RTOS USBX contains expired pointer dereference vulnerabilities in its CDC ACM host class component. These use-after-free style flaws allow attackers to dereference freed memory pointers, leading to potential remote code execution. The vulnerability affects USBX versions 6.2.1 and below.
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< 6.3.0CVSS 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 USBX version in useInspect the USBX header files (ux_version.h or similar) or build configuration to find the defined USBX version numberAffected if The version number found is below 6.3.0 (e.g., 6.2.1, 6.2.0, or earlier)
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Verify CDC ACM host class is included in the buildCheck the build configuration or source files for presence of UX_HOST_CLASS_CDC_ACM or related CDC ACM definitionsAffected if CDC ACM host class support is compiled into the firmware or application
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Confirm CDC ACM host is actively usedReview application code to see if USB CDC ACM device connections are initiated or handled by the systemAffected if The system processes or expects CDC ACM class USB device connections
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Check for memory corruption indicatorsAnalyze any crash dumps, assert failures, or memory logs related to USB CDC ACM operations for patterns consistent with use-after-free (e.g., dereference of freed pointers)Affected if Memory corruption or crashes occur in USBX CDC ACM host code paths
The environment is affected if USBX version is below 6.3.0 AND the CDC ACM host class component is in use, since the vulnerability requires both conditions to be exploitable.
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.
dbcve · scoped6.3.0
Upgrade to USBX release 6.3.0 or later. No workarounds are available for this vulnerability.
USBX 6.3.0
- Obtain Azure RTOS USBX version 6.3.0 or later from the official Microsoft Azure RTOS GitHub repository
- Replace the existing USBX library files in your project with the version 6.3.0 files
- Rebuild your firmware application with the updated USBX library
- Redeploy the updated firmware to your embedded device
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation6.0 h
- Implementation12.0 h
- Testing16.0 h
- Review / QA6.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $10,944.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-48696 — 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-2023-48696 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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