CVE-2025-21066
📋 TL;DR
An out-of-bounds read vulnerability in Samsung Notes' SPI decoder allows local attackers to access memory beyond intended boundaries. This affects Samsung Notes versions prior to 4.4.30.63 on Samsung mobile devices. Attackers must have local access to the device to exploit this vulnerability.
💻 Affected Systems
- Samsung Notes
📦 What is this software?
Notes by Samsung
⚠️ Risk & Real-World Impact
Worst Case
Local attacker could potentially read sensitive data from adjacent memory regions, possibly exposing authentication tokens, encryption keys, or other application data.
Likely Case
Application crash or instability, with potential limited information disclosure from adjacent memory regions.
If Mitigated
Minimal impact with proper application sandboxing and memory protection mechanisms in place.
🎯 Exploit Status
Requires local access to device and knowledge of memory layout. No public exploit code available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.4.30.63 or later
Vendor Advisory: https://security.samsungmobile.com/serviceWeb.smsb?year=2025&month=10
Restart Required: No
Instructions:
1. Open Galaxy Store on Samsung device. 2. Search for Samsung Notes. 3. Update to version 4.4.30.63 or later. 4. Alternatively, enable automatic updates in Galaxy Store settings.
🔧 Temporary Workarounds
Disable Samsung Notes
AndroidTemporarily disable the Samsung Notes application to prevent exploitation
Settings > Apps > Samsung Notes > Disable
🧯 If You Can't Patch
- Restrict physical access to devices containing sensitive data
- Implement application whitelisting to prevent unauthorized app execution
🔍 How to Verify
Check if Vulnerable:
Check Samsung Notes version in Galaxy Store or app info: Settings > Apps > Samsung Notes > App infoCheck Version:
No command line option. Check via Galaxy Store or app settings.Verify Fix Applied:
Confirm Samsung Notes version is 4.4.30.63 or later in app info📡 Detection & Monitoring
Log Indicators:
- Application crashes of Samsung Notes
- Memory access violation logs
Network Indicators:
- No network indicators - local vulnerability only
SIEM Query:
No specific SIEM query - monitor for Samsung Notes crash reports