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AndroidOperating system · Google

CVE-2019-9240

MEDIUM · 5.0 CVSS v3.1 Published 2019-09-27
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
50/100
Remediation priority · Moderate

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 · unedited
In NFC, there is a possible out of bounds read due to a missing bounds check. This could lead to local information disclosure with no additional execution privileges needed. User interaction is needed for exploitation. Product: AndroidVersions: Android-10Android ID: A-121150966

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 confidence

In Android 10, the NFC component contains an out-of-bounds read vulnerability caused by a missing bounds check. An attacker can exploit this by crafting malicious NFC data that triggers the read beyond buffer boundaries, leading to disclosure of sensitive information from memory. Successful exploitation requires user interaction to initiate the NFC communication.

MitigationApply the Android security patch for CVE-2019-9240 (Android-10 patch level). Users should avoid accepting NFC connections from untrusted devices until the update is installed.

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
AndroidOperating system
Affected:= 10.0

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
Local
Complexity
Low
Privileges
Low
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

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 checks

Work through these to decide whether this CVE applies to you.

  1. Verify Android version
    Check if the device is running Android 10.0 (API level 29). Go to Settings > About Phone > Android version. The exact version number should read '10'.
    Affected if Device is running Android 10.0 and the CVE-2019-9240 patch has not been applied
  2. Confirm NFC is enabled
    Check if NFC is turned on. Navigate to Settings > Network & Internet > NFC (or Settings > Connections > NFC on Samsung devices). Verify if the NFC toggle is enabled.
    Affected if NFC is enabled on an Android 10.0 device that lacks the CVE-2019-9240 security patch
  3. Check security patch level
    Go to Settings > About Phone > Security patch level. This displays the date of the installed Android security update.
    Affected if Security patch level predates the Android 10 patch that addresses CVE-2019-9240 - the exact patched date varies by device manufacturer

A device is affected if it runs Android 10.0 with NFC enabled and has a security patch level older than the CVE-2019-9240 fix.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply the Android security patch for CVE-2019-9240 (Android-10 patch level). Users should avoid accepting NFC connections from untrusted devices until the update is installed.

Fix this in Android Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing4.0 h
  • Review / QA2.0 h
13.0 hours of engineering $2,280
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2019-9240 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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
  • No spam, self-promotion, credentials, or personal data