CVE-2025-21068
📋 TL;DR
This vulnerability allows local attackers to read memory outside the intended bounds when processing image data in Samsung Notes. It affects users of Samsung Notes versions prior to 4.4.30.63 on Samsung mobile devices. The out-of-bounds read could potentially expose sensitive information from device memory.
💻 Affected Systems
- Samsung Notes
📦 What is this software?
Notes by Samsung
⚠️ Risk & Real-World Impact
Worst Case
An attacker with local access could read sensitive data from device memory, potentially exposing authentication tokens, passwords, or other confidential information stored in adjacent memory regions.
Likely Case
Local attackers could cause application crashes or read limited amounts of non-sensitive data from adjacent memory buffers, potentially leading to information disclosure.
If Mitigated
With proper application sandboxing and memory protection mechanisms, the impact would be limited to the Samsung Notes application's memory space only.
🎯 Exploit Status
Exploitation requires local access to the device and knowledge of how to trigger the out-of-bounds read through specially crafted image files.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.4.30.63 and 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 auto-update for Samsung Notes in Galaxy Store settings.
🔧 Temporary Workarounds
Disable Samsung Notes
allTemporarily disable the Samsung Notes application to prevent exploitation
Go to Settings > Apps > Samsung Notes > Disable
Restrict image file access
allPrevent Samsung Notes from accessing untrusted image files
Use file manager to move sensitive images to secure locations
Avoid opening untrusted image files in Samsung Notes
🧯 If You Can't Patch
- Implement application whitelisting to restrict which apps can run on affected devices
- Use mobile device management (MDM) to restrict installation of untrusted applications and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Open Samsung Notes > Settings > About Samsung Notes to check version numberCheck Version:
On Samsung device: Settings > Apps > Samsung Notes > App infoVerify Fix Applied:
Verify Samsung Notes version is 4.4.30.63 or higher after update📡 Detection & Monitoring
Log Indicators:
- Samsung Notes crash logs
- Memory access violation errors in system logs
- Unexpected application termination events
Network Indicators:
- No network indicators - this is a local vulnerability
SIEM Query:
Application: "Samsung Notes" AND (EventID: "1000" OR EventID: "1001") AND Description CONTAINS "access violation"