CVE-2025-21008
📋 TL;DR
This vulnerability allows local attackers to cause memory corruption via an out-of-bounds read in the libsavsvc.so library when decoding frame headers. It affects Android devices running versions prior to Android 15. Attackers must have local access to the device to exploit this flaw.
💻 Affected Systems
- Samsung Android devices
📦 What is this software?
Android by Samsung
Android is Google's open-source mobile operating system powering over 3 billion devices worldwide, including smartphones, tablets, smart TVs, automotive systems, wearables, and IoT devices. As the world's dominant mobile OS with approximately 72% global market share, Android serves as the foundation...
Learn more about Android →⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation leading to full device compromise, data theft, or persistent malware installation.
Likely Case
Application crashes, denial of service, or limited information disclosure from memory corruption.
If Mitigated
Minimal impact if proper sandboxing and memory protection mechanisms are enforced by the OS.
🎯 Exploit Status
Requires local access and specific conditions to trigger the out-of-bounds read. No public exploit code identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android 15 or Samsung security updates from July 2025 onward
Vendor Advisory: https://security.samsungmobile.com/serviceWeb.smsb?year=2025&month=07
Restart Required: Yes
Instructions:
1. Check for system updates in Settings > Software update. 2. Install Android 15 update if available. 3. Alternatively, install Samsung's July 2025 security patch. 4. Reboot device after installation.
🔧 Temporary Workarounds
Restrict local access
allLimit physical access to devices and enforce strong authentication policies
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks and data
- Implement application whitelisting to prevent unauthorized code execution
🔍 How to Verify
Check if Vulnerable:
Check Android version in Settings > About phone > Software information. If version is below Android 15, device may be vulnerable.Check Version:
adb shell getprop ro.build.version.releaseVerify Fix Applied:
Verify Android version is 15 or higher, or check that July 2025 security patch is installed in Settings > About phone > Software information.📡 Detection & Monitoring
Log Indicators:
- Application crashes related to libsavsvc.so
- Memory access violation logs in system logs
Network Indicators:
- No network indicators - local exploitation only
SIEM Query:
source="android_system" AND ("libsavsvc" OR "memory corruption" OR "segmentation fault")