CVE-2025-21009
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 · uneditedOut-of-bounds read in decoding malformed frame header in libsavsvc.so prior to Android 15 allows local attackers to cause memory corruption.
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 confidenceAn out-of-bounds read vulnerability exists in libsavsvc.so in Android versions prior to Android 15. The vulnerability occurs during decoding of malformed frame headers, allowing local attackers to read memory beyond allocated buffers and cause memory corruption.
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< 15.0CVSS 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
- 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.
-
Check the Android version on the deviceGo to Settings > About Phone > Android version, or run 'getprop ro.build.version.release' via ADB shellAffected if The Android version shown is less than 15.0 (such as 14.x, 13.x, or earlier)
-
Identify the device manufacturer and modelCheck Settings > About Phone > Model number, or run 'getprop ro.product.model' and 'getprop ro.product.brand' via ADB shellAffected if The device is a Samsung Android device running a version prior to Android 15
-
Locate the libsavsvc.so library on the deviceSearch for the library file using 'find / -name libsavsvc.so 2>/dev/null' via ADB shell, or check common system library directoriesAffected if The library file exists on the device (its presence indicates the affected component is installed)
-
Verify the library version if accessibleIf the library is found, run 'ls -la <path_to_libsavsvc.so>' to check file metadata, or use 'dumpsys <package>' if the library is tied to a specific system serviceAffected if The library is present and the device runs Android version 14 or earlier
The environment is affected if the Samsung Android device runs any version prior to Android 15.0 and contains the libsavsvc.so library, which is present by default in unpatched Android releases.
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.
dbcve · scoped15.0
Update affected Android devices to version 15 or later to obtain the patched libsavsvc.so library. For organizations, deploy the Android 15 update through your mobile device management (MDM) infrastructure.
Android 15.0
- Check your device's current Android version in Settings > About Phone > Android version
- Ensure your device is connected to Wi-Fi and has sufficient battery (>50%)
- Back up important data to Google Drive or local storage
- Go to Settings > System > Software Update > Check for updates
- If Android 15 update is available, tap Download and install
- Wait for the update to download, then tap Install now
- Allow the device to restart and complete the installation process
- After reboot, verify the new Android version is 15.0 or later in Settings > About Phone
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 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 $3,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-21009 — 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-2025-21009 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
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.
- 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