CVE-2025-7916
📋 TL;DR
WinMatrix3 software from Simopro Technology has a critical insecure deserialization vulnerability that allows unauthenticated remote attackers to execute arbitrary code on affected servers by sending malicious serialized data. This affects all systems running vulnerable versions of WinMatrix3, potentially giving attackers complete control over the server.
💻 Affected Systems
- WinMatrix3
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full administrative control, data theft, ransomware deployment, and persistent backdoor installation.
Likely Case
Remote code execution leading to data exfiltration, lateral movement within the network, and installation of malware or cryptocurrency miners.
If Mitigated
Limited impact if proper network segmentation, application firewalls, and strict access controls are implemented to block exploitation attempts.
🎯 Exploit Status
The vulnerability requires sending crafted serialized data to the vulnerable endpoint, which is relatively straightforward for attackers with knowledge of the deserialization mechanism.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check with Simopro Technology for specific patched version
Vendor Advisory: https://www.twcert.org.tw/en/cp-139-10257-e88f3-2.html
Restart Required: Yes
Instructions:
1. Contact Simopro Technology for the latest patched version of WinMatrix3
2. Backup current configuration and data
3. Install the patched version following vendor instructions
4. Restart the WinMatrix3 service or server
5. Verify the patch is applied successfully
🔧 Temporary Workarounds
Network Segmentation and Firewall Rules
windowsRestrict network access to WinMatrix3 services to only trusted IP addresses and networks
Windows Firewall: New-NetFirewallRule -DisplayName "Block WinMatrix3 External" -Direction Inbound -Protocol TCP -LocalPort [PORT] -RemoteAddress NotLocalSubnet -Action Block
Application Layer Filtering
allImplement WAF rules to block serialized data patterns in requests to WinMatrix3 endpoints
🧯 If You Can't Patch
- Isolate WinMatrix3 servers in a dedicated network segment with strict access controls
- Implement application-level monitoring and alerting for suspicious deserialization attempts
🔍 How to Verify
Check if Vulnerable:
Check WinMatrix3 version against vendor advisory and test if deserialization endpoints accept serialized objectsCheck Version:
Check WinMatrix3 application interface or configuration files for version informationVerify Fix Applied:
Verify patched version is installed and test that malicious serialized payloads are rejected📡 Detection & Monitoring
Log Indicators:
- Unusual serialized data patterns in application logs
- Unexpected process execution from WinMatrix3 service
- Failed deserialization attempts with error messages
Network Indicators:
- Unusual outbound connections from WinMatrix3 server
- Large serialized payloads sent to WinMatrix3 endpoints
- Traffic patterns matching known exploit payloads
SIEM Query:
source="WinMatrix3" AND (message="*deserialization*" OR message="*serialized*" OR process_execution="*cmd*" OR process_execution="*powershell*")