CVE-2025-20687
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 Bluetooth driver, there is a possible out of bounds read due to an incorrect bounds check. This could lead to local denial of service with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00418045; Issue ID: MSV-3481.
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 Bluetooth driver vulnerability involving an out of bounds read due to an incorrect bounds check. The flaw allows local denial of service via user execution privileges without requiring user interaction. The issue is addressed by vendor patch WCNCR00418045.
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<= 3.6CVSS 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
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/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.
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Identify Mediatek NBIoT SDK versionCheck your project's SDK version by reviewing the SDK release notes, firmware metadata, or build configuration files that reference the Mediatek NBIoT SDK versionAffected if SDK version is 3.6 or lower (any version <= 3.6)
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Verify Bluetooth functionality is in useDetermine if your device or application utilizes the Bluetooth driver component from the Mediatek NBIoT SDK. Check runtime configuration, device logs, or firmware feature flags that enable Bluetooth.Affected if Bluetooth driver is enabled and actively used
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Check for vendor patch WCNCR00418045Review firmware changelogs, patch applied records, or contact Mediatek to verify if the WCNCR00418045 patch has been applied to the Bluetooth driver codeAffected if Patch WCNCR00418045 has NOT been applied to the Bluetooth driver
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Confirm the out-of-bounds read conditionMonitor system stability and Bluetooth operation logs for crash events, memory access errors, or unexpected termination that may indicate the vulnerability is being triggeredAffected if Bluetooth driver crashes or stability issues occur without other known causes
A defender is affected if they are using Mediatek NBIoT SDK version 3.6 or lower with Bluetooth enabled and without the WCNCR00418045 patch applied to the Bluetooth driver.
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 (WCNCR00418045) to the Bluetooth driver firmware/software. Verify the update does not introduce regressions in Bluetooth functionality.
- Consultation3.0 h
- Implementation4.0 h
- Testing6.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,128.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-20687 — 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-2025-20687 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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