CVE-2025-2329
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 high traffic environments, a Silicon Labs OpenThread RCP (see impacted versions) fails to clear the SPI transmit buffer and may send a corrupt packet over SPI to its host, causing the host to reset the RCP which results in a 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 confidenceIn high traffic environments, the Silicon Labs OpenThread RCP firmware fails to properly clear the SPI transmit buffer before transmission, leading to corrupt SPI packets being sent to the host. This causes the host to reset the RCP, resulting in 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
- Adjacent
- Complexity
- Low
- Privileges
- None
- Authentication
- X
- User interaction
- None
- Scope
- X
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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 OpenThread RCP firmware in useLocate the Silicon Labs OpenThread RCP device in your network infrastructure and note its model/firmware type. Check device documentation or network management interfaces for OpenThread RCP firmware identification.Affected if The device is running Silicon Labs OpenThread RCP firmware.
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Determine the firmware versionAccess the RCP device via its management interface (serial debug, Silicon Labs tool, or network management system) and retrieve the current firmware version string. Compare this version against any vendor release notes or security advisories for CVE-2025-2329.Affected if The firmware version is unpatched and older than the vendor-provided fix.
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Verify Thread network traffic levelsMonitor the Thread network for periods of high traffic. Use network monitoring tools or the RCP diagnostics interface to observe packet rates and network activity.Affected if The Thread network operates in high traffic conditions where the SPI buffer issue is triggered.
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Check for unexpected RCP resetsReview system logs, host system event logs, and RCP diagnostic logs for unexpected resets, lost connection events, or RCP restart messages, particularly correlated with high traffic periods.Affected if Unexpected host-triggered RCP resets are occurring in the environment.
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Inspect SPI communication integrityIf available, review SPI communication diagnostics or packet captures between the host and RCP. Look for corrupted packets, CRC errors, or malformed SPI transactions.Affected if Corrupt SPI packets are being transmitted from the RCP to the host.
The environment is affected if Silicon Labs OpenThread RCP firmware is deployed and experiences unexpected resets during high-traffic Thread network operation, with unpatched firmware being the root cause.
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-provided firmware patch to the OpenThread RCP devices. In the interim, monitor for unexpected host resets in high-traffic Thread network deployments.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-2329 — 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-2025-2329 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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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
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