CVE-2019-9391
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 libxaac, there is a possible out of bounds read due to uninitialized data. This could lead to information disclosure with no additional execution privileges needed. User interaction is needed for exploitation. Product: AndroidVersions: Android-10Android ID: A-111050781
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 libxaac (Android's AAC audio decoder), an out of bounds read vulnerability exists due to uninitialized data being read from memory. This allows information disclosure - potentially exposing sensitive data from process memory - without requiring elevated privileges, though user interaction (e.g., playing a crafted audio file) is needed to trigger the vulnerable code path.
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
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/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 checksWork through these to decide whether this CVE applies to you.
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Verify Android version is 10.0Check the device settings under Settings > About Phone > Android version, or run 'getprop ro.build.version.release' via ADB shellAffected if The version is exactly Android 10.0 (API level 29)
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Confirm libxaac library presenceCheck for the library file at /system/lib64/libaudiofoundation.so or similar libxaac references using 'find /system -name "*xaac*"' via ADB shellAffected if libxaac or related audio libraries exist on the device
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Identify AAC audio processing capabilityCheck if any apps can process AAC audio files by examining installed media players or running 'pm list packages | grep -i audio' via ADB shellAffected if Applications capable of playing AAC audio files are installed
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Check for untrusted audio file processingDetermine if the device accepts AAC audio files from external or untrusted sources, such as receiving files via messaging apps or downloading from the webAffected if Users can open or play AAC files from untrusted sources on the device
The environment is affected if running Android 10.0 and any application on the device can process AAC audio files from untrusted sources, enabling the out-of-bounds read in libxaac.
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 dataEnsure libxaac is updated to a version that properly initializes all data structures and buffers before reading. Until a patch is available, avoid processing untrusted AAC audio files with Android-10 devices.
- Consultation2.0 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 $3,808.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-9391 — 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-2019-9391 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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