CVE-2019-9257
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, there is a possible out of bounds write due to an integer overflow. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Product: AndroidVersions: Android-10Android ID: A-113572342
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 confidenceIn Android 10's Bluetooth stack, an integer overflow vulnerability exists that allows an attacker to trigger an out-of-bounds write. This occurs when the integer overflow is not properly validated before calculating memory allocation sizes, leading to local privilege escalation without requiring user interaction or additional execution privileges.
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= 10.0CVSS 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
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/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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Confirm Android version is exactly 10.0Go to Settings > About Phone > Android version (or run 'getprop ro.build.version.release' via ADB)Affected if Version displays as 10.0 exactly - versions before or after Android 10 are not affected by this specific CVE
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Verify device has Bluetooth capabilityCheck that the device hardware supports Bluetooth and that Bluetooth is not permanently disabled in hardware or bootloaderAffected if Device lacks Bluetooth hardware entirely, then the Bluetooth stack vulnerability does not apply
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Check Android security patch levelGo to Settings > About Phone > Security patch level (or run 'getprop ro.build.version.security_patch' via ADB)Affected if Patch level is earlier than the February 2019 security update - the vulnerability was addressed in Android 10's monthly security update for CVE-2019-9257
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Confirm Bluetooth is enabled and actively usedCheck Bluetooth toggle in Settings or run 'settings get global bluetooth_on' via ADBAffected if Bluetooth is turned on - the vulnerability exists within the active Bluetooth stack component, though the code is present regardless of on/off state
Device is affected if it runs Android 10.0 exactly, has Bluetooth hardware, and has a security patch level predating the fix for CVE-2019-9257
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 Android security patch for CVE-2019-9257 (part of Android 10's monthly security update) to the affected device's Bluetooth stack. For custom ROMs or embedded systems, obtain and integrate the corresponding AOSP patch addressing the integer overflow in Bluetooth component.
- Consultation2.0 h
- Implementation4.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,096.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-9257 — 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-2019-9257 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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