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Azure Rtos Netx DuoOperating system · Microsoft

CVE-2023-48316

CRITICAL · 9.8 CVSS v3.1 Published 2023-12-05
Fix available
A fix is available. Upgrade to 6.3.0 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

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 · unedited
Azure RTOS NetX Duo is a TCP/IP network stack designed specifically for deeply embedded real-time and IoT applications. An attacker can cause remote code execution due to memory overflow vulnerabilities in Azure RTOS NETX Duo. The affected components include processes/functions related to snmp, smtp, ftp and dtls in RTOS v6.2.1 and below. The fixes have been included in NetX Duo 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 confidence

Azure RTOS NetX Duo contains memory overflow vulnerabilities (buffer overflows) in SNMP, SMTP, FTP, and DTLS components that allow remote code execution. The vulnerability affects versions 6.2.1 and below of the TCP/IP network stack designed for embedded and IoT applications.

MitigationUpgrade Azure RTOS NetX Duo to version 6.3.0 or later. No workarounds are available, so immediate patching is critical given the critical CVSS score and RCE capability.

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
Azure Rtos Netx DuoOperating system
Affected:< 6.3.0

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
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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify if NetX Duo is in use
    Search firmware images, build artifacts, or device documentation for references to 'NetX Duo', 'Azure RTOS', or the nx_*.h header files typically found in NetX Duo installations
    Affected if NetX Duo is present in the environment
  2. Determine the installed NetX Duo version
    Locate the NetX Duo library binary or source code version header (often in version.h, nx_api.h, or library file metadata) and note the version string
    Affected if The version is 6.2.1 or below, or any version earlier than 6.3.0
  3. Check if SNMP component is enabled
    Inspect the build configuration or #define statements in the project for NX_SNMP_ENABLE or similar SNMP-related configuration flags in the NetX Duo headers
    Affected if SNMP is compiled or enabled in the build
  4. Check if SMTP component is enabled
    Inspect the build configuration for NX_SMTP_ENABLE or SMTP-related defines in the NetX Duo configuration files
    Affected if SMTP is compiled or enabled in the build
  5. Check if FTP component is enabled
    Inspect the build configuration for NX_FTP_SERVER_ENABLE or FTP-related defines in the NetX Duo configuration
    Affected if FTP server is compiled or enabled in the build
  6. Check if DTLS component is enabled
    Inspect the build configuration for NX_SECURE_ENABLE and NX_DTLS_ENABLE or DTLS-related defines in the NetX Duo configuration
    Affected if DTLS is compiled or enabled in the build

The environment is affected if Azure RTOS NetX Duo version is below 6.3.0 AND one or more of the SNMP, SMTP, FTP, or DTLS components are enabled in the build.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Upgrade available Upgrade to 6.3.0 or later
Fixed in 6.3.0
Interim mitigation

Upgrade Azure RTOS NetX Duo to version 6.3.0 or later. No workarounds are available, so immediate patching is critical given the critical CVSS score and RCE capability.

Recommended fix High confidence

NetX Duo 6.3.0

  1. Download Azure RTOS NetX Duo version 6.3.0 or later from the official Microsoft Azure RTOS repository or distribution channel
  2. Replace the existing NetX Duo library files in your project with the updated version 6.3.0
  3. Rebuild and recompile your application firmware with the updated NetX Duo library
  4. Deploy the newly built firmware to your affected devices
  5. Verify that all network functionality (specifically SNMP, SMTP, FTP, and DTLS components) operates correctly after the update

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Azure Rtos Netx Duo Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing8.0 h
  • Review / QA4.0 h
24.0 hours of engineering $4,160
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2023-48316 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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