CVE-2025-21006
📋 TL;DR
This vulnerability allows local attackers to write out-of-bounds memory in the MPEG4 codec handling within libsavsvc.so on Android devices. It affects Android devices prior to version 15 that use Samsung's implementation. Attackers need local access to exploit this memory corruption issue.
💻 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, arbitrary code execution, or persistent malware installation.
Likely Case
Application crashes, denial of service, or limited privilege escalation within the media processing context.
If Mitigated
No impact if patched or if exploit attempts are blocked by security controls.
🎯 Exploit Status
Requires local access and ability to trigger MPEG4 processing. No public exploit details available as of advisory date.
🛠️ 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 latest Samsung security update from July 2025 or later. 4. Reboot device after installation.
🔧 Temporary Workarounds
Disable MPEG4 processing
androidPrevent vulnerable library from processing MPEG4 files
Restrict media file sources
androidOnly allow media files from trusted sources
🧯 If You Can't Patch
- Isolate vulnerable devices from untrusted users and networks
- Implement application allowlisting to prevent unauthorized media processing apps
🔍 How to Verify
Check if Vulnerable:
Check Android version in Settings > About phone > Software information. If version is below 15, device is potentially vulnerable.Check Version:
adb shell getprop ro.build.version.releaseVerify Fix Applied:
Verify Android version is 15 or higher, or check Samsung security patch level is July 2025 or later in Settings > About phone > Software information.📡 Detection & Monitoring
Log Indicators:
- Media server crashes
- libsavsvc.so segmentation faults
- MPEG4 processing errors
Network Indicators:
- None - local exploitation only
SIEM Query:
Process:libsavsvc.so AND (EventID:1000 OR Signal:SIGSEGV)