CVE-2019-9436
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 the Android kernel in the bootloader there is a possible secure boot bypass. This could lead to local escalation of privilege with System execution privileges needed. User interaction is needed for exploitation.
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 the Android kernel bootloader, a vulnerability exists that allows secure boot bypass. This enables local privilege escalation to System level, though user interaction is required for exploitation.
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 dataall versionsCVSS 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
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:H/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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Identify the device model and manufacturerDetermine the exact make and model of the Android device. This is needed because bootloader patches are released by OEMs, not through standard Android version updates.Affected if The device runs Google Android and has not received a bootloader/firmware patch from the OEM.
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Check the bootloader versionAccess the device bootloader or recovery mode (typically by holding volume down + power during boot) and note the bootloader version number displayed. Compare this to any patch information available from the device manufacturer.Affected if The bootloader version cannot be verified as patched by the OEM, or no patch information is available from the manufacturer.
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Verify secure boot statusIf accessible in the device bootloader settings, check whether secure boot or verified boot is enabled. This is typically found in the bootloader or developer options.Affected if Secure boot is disabled or cannot be confirmed as enabled, indicating the device may be vulnerable to the bypass.
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Confirm Android version is not the remediation vectorRecall that this vulnerability cannot be patched through standard Android system updates. Check if the device has received a dedicated bootloader or firmware update from the OEM rather than just a system software update.Affected if The device has only received system updates without a corresponding bootloader/firmware update from the OEM.
The device is likely affected if it runs any version of Google Android and the bootloader has not received a specific OEM-issued firmware patch addressing the secure boot bypass vulnerability.
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 device manufacturer bootloader/firmware patch. This requires obtaining and flashing an updated bootloader from the OEM, as secure boot bypasses cannot be remediated through software updates alone.
- Consultation8.0 h
- Implementation2.0 h
- Testing12.0 h
- Review / QA6.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-9436 — 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-2019-9436 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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