CVE-2025-21057
📋 TL;DR
This vulnerability in Samsung Notes allows local attackers to access shared notes through improper use of implicit intents. It affects Samsung Notes versions prior to 4.4.30.63 on Samsung Android devices. The attack requires physical access or local execution on the device.
💻 Affected Systems
- Samsung Notes
📦 What is this software?
Notes by Samsung
⚠️ Risk & Real-World Impact
Worst Case
Local attackers could access sensitive notes containing personal information, credentials, or confidential data stored in shared notes.
Likely Case
Malicious apps or users with physical access could read shared notes they shouldn't have access to, potentially exposing personal information.
If Mitigated
With proper app sandboxing and updated software, the vulnerability is eliminated and no data exposure occurs.
🎯 Exploit Status
Requires local access to device or ability to execute code locally. Exploitation involves crafting malicious intents to intercept or access shared notes data.
🛠️ 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 Google Play Store on Samsung device. 2. Search for 'Samsung Notes'. 3. If update available, tap 'Update'. 4. Alternatively, update through Samsung Galaxy Store if installed.
🔧 Temporary Workarounds
Disable Samsung Notes
AndroidTemporarily disable the Samsung Notes app to prevent exploitation
Settings > Apps > Samsung Notes > Disable
Avoid sharing sensitive notes
allDo not use shared notes feature for sensitive information until patched
🧯 If You Can't Patch
- Restrict physical access to devices containing sensitive notes
- Use alternative note-taking apps without this vulnerability for sensitive information
🔍 How to Verify
Check if Vulnerable:
Check Samsung Notes version in app settings or Google Play Store. If version is below 4.4.30.63, device is vulnerable.Check Version:
No CLI command. Check via: Settings > Apps > Samsung Notes > App info > VersionVerify Fix Applied:
Confirm Samsung Notes version is 4.4.30.63 or higher in app settings.📡 Detection & Monitoring
Log Indicators:
- Unusual intent broadcasts to Samsung Notes
- Multiple failed intent resolutions targeting Samsung Notes
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
No network-based detection. Monitor for suspicious local app behavior or intent abuse on Android devices.