CVE-2025-21064
📋 TL;DR
This vulnerability allows attackers on the same network to bypass authentication in Samsung Smart Switch and access data being transferred between devices. It affects Smart Switch versions before 3.7.66.6. Users transferring sensitive data via Smart Switch on shared networks are at risk.
💻 Affected Systems
- Samsung Smart Switch
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers intercept sensitive personal data (photos, messages, documents) during device transfers, potentially leading to identity theft, blackmail, or corporate espionage.
Likely Case
Unauthorized access to personal media files, contacts, and messages being transferred between devices on public Wi-Fi or shared networks.
If Mitigated
Limited exposure if using isolated networks, but still vulnerable to insider threats or compromised devices on the same network segment.
🎯 Exploit Status
The vulnerability requires adjacent network access but no authentication, making it relatively easy to exploit for attackers on the same network.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.7.66.6
Vendor Advisory: https://security.samsungmobile.com/serviceWeb.smsb?year=2025&month=10
Restart Required: Yes
Instructions:
1. Open Samsung Smart Switch. 2. Go to Help > Check for Updates. 3. If update to 3.7.66.6 is available, install it. 4. Restart Smart Switch after installation completes.
🔧 Temporary Workarounds
Disable Smart Switch Network Transfers
allTemporarily disable Smart Switch's network functionality and use USB cable transfers only
Not applicable - configuration change in application
Network Segmentation
allIsolate devices using Smart Switch on dedicated VLAN or network segment
# Example for network isolation
# Configure firewall rules to restrict Smart Switch traffic
# Use VLAN segmentation for device transfer networks
🧯 If You Can't Patch
- Use USB cable transfers only instead of wireless transfers
- Ensure Smart Switch is only used on trusted, isolated networks (not public Wi-Fi)
🔍 How to Verify
Check if Vulnerable:
Open Smart Switch, go to Help > About Smart Switch, check if version is below 3.7.66.6Check Version:
Not applicable - check through application GUI (Help > About Smart Switch)Verify Fix Applied:
After updating, verify version shows 3.7.66.6 or higher in Help > About Smart Switch📡 Detection & Monitoring
Log Indicators:
- Unexpected network connections to Smart Switch ports
- Multiple failed authentication attempts followed by successful data transfer
Network Indicators:
- Unusual data transfer patterns from Smart Switch to unexpected IP addresses
- Traffic on Smart Switch ports (default 54925) from unauthorized sources
SIEM Query:
source_port:54925 AND (dest_ip NOT IN [trusted_device_ips]) OR (auth_failure_count > 0 AND subsequent_data_transfer)