CVE-2025-21007
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 write in accessing uninitialized memory 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 · moderate confidenceAn out-of-bounds write vulnerability exists in libsavsvc.so on Android devices prior to version 15. The flaw occurs when the library accesses uninitialized memory, allowing a local attacker to write beyond allocated buffer boundaries 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.
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Verify Android versionGo to Settings > About Phone > Android version or run 'getprop ro.build.version.sdk' via ADB shellAffected if Android version is below 15 (SDK < 35)
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Confirm device manufacturerCheck Settings > About Phone > Manufacturer or run 'getprop ro.product.manufacturer' via ADB shellAffected if Device is a Samsung product (the vulnerability specifically affects Samsung Android)
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Locate the vulnerable libraryCheck for the presence of libsavsvc.so in /system/lib/ or /vendor/lib/ directories using 'find / -name libsavsvc.so 2>/dev/null' via ADB shellAffected if The library file libsavsvc.so exists on the device
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Determine library version if availableRun 'ls -la /system/lib/libsavsvc.so' or 'ls -la /vendor/lib/libsavsvc.so' to check file metadata, or use 'strings libsavsvc.so | grep version' if file is extractedAffected if Library version cannot be determined or is prior to the version bundled with Android 15
A Samsung Android device running version below 15 with the libsavsvc.so library present is affected by this out-of-bounds write 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.
dbcve · scoped15.0
Update affected Android devices to version 15 or later to receive the patched libsavsvc.so library. As a defense-in-depth measure, disable or restrict access to any applications or services that utilize this library if updates are not immediately available.
Android 15.0
- Verify your current Android version by navigating to Settings > About Phone > Android version
- Check if your device is eligible for Android 15.0 update by visiting your device manufacturer's support page
- If Android 15.0 is available, initiate the update via Settings > System > Software update > Download and install
- Ensure the device is connected to Wi-Fi and has sufficient battery (recommended above 50%) before starting the update
- After updating to Android 15.0, verify the libsavsvc.so component has been updated to the patched version
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation1.0 h
- Testing4.0 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 $2,752.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-21007 — 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-2025-21007 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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