CVE-2025-55081
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 · uneditedIn Eclipse Foundation NextX Duo before 6.4.4, a module of ThreadX, the _nx_secure_tls_process_clienthello() function was missing length verification of certain SSL/TLS client hello message: the ciphersuite length and compression method length. In case of an attacker-crafted message with values outside of the expected range, it could cause an out-of-bound read.
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 confidenceA missing bounds check vulnerability in ThreadX's TLS implementation allows an attacker sending a specially crafted TLS ClientHello message to trigger an out-of-bounds read. The _nx_secure_tls_process_clienthello() function fails to validate the ciphersuite length and compression method length fields before using them, which can be exploited with values outside expected ranges.
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< 6.4.4.202503CVSS 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
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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 ThreadX NetX Duo versionCheck the NetX Duo library version in your build artifacts, header files, or firmware (often in nx_secure.h or similar version headers). Look for a version string or build timestamp.Affected if The installed version is earlier than 6.4.4.202503.
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Verify TLS support is enabledInspect your build configuration or source code to confirm NX_SECURE_TLS is defined and the TLS module is compiled into the firmware image.Affected if TLS support is enabled in the build.
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Confirm TLS server role is usedReview your application code to determine if the device accepts incoming TLS connections (acts as a TLS server) using nx_secure_tls_server_start or equivalent TLS server APIs.Affected if The device functions as a TLS server accepting ClientHello messages from clients.
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Check for ClientHello processing pathSearch the firmware or source for calls to _nx_secure_tls_process_clienthello or nx_secure_tls_client_handshake to confirm the TLS handshake processing path exists.Affected if The code includes TLS ClientHello processing for incoming connections.
A device is affected if it runs Eclipse ThreadX NetX Duo versions before 6.4.4.202503, has TLS enabled, and accepts incoming TLS connections where it processes ClientHello messages.
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 · scoped6.4.4.202503
Upgrade Eclipse Foundation NextX Duo to version 6.4.4 or later to obtain the patched version that includes proper length validation for ciphersuite and compression method fields in TLS ClientHello processing.
6.4.4.202503
- Upgrade Eclipse ThreadX NetX Duo to version 6.4.4.202503 or later
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing8.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-55081 — 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-2025-55081 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
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