CVE-2025-58718
📋 TL;DR
This vulnerability is a use-after-free memory corruption flaw in Microsoft Remote Desktop Client that allows unauthorized attackers to execute arbitrary code remotely over a network. Attackers can exploit this to take control of affected systems. Users running vulnerable versions of Microsoft Remote Desktop Client are affected.
💻 Affected Systems
- Microsoft Remote Desktop Client
📦 What is this software?
Windows 10 1507 by Microsoft
Windows 10 1507 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 11 22h2 by Microsoft
Windows 11 23h2 by Microsoft
Windows 11 24h2 by Microsoft
Windows 11 25h2 by Microsoft
Windows App by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with remote code execution leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Remote code execution allowing attackers to install malware, steal credentials, or pivot to other systems on the network.
If Mitigated
Limited impact with proper network segmentation and endpoint protection blocking exploitation attempts.
🎯 Exploit Status
Use-after-free vulnerabilities typically require specific memory manipulation but can be reliably exploited once understood.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: To be specified in Microsoft's monthly security updates
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-58718
Restart Required: Yes
Instructions:
1. Open Windows Update settings
2. Check for updates
3. Install all available security updates
4. Restart system when prompted
🔧 Temporary Workarounds
Disable Remote Desktop Client
windowsTemporarily disable or uninstall Remote Desktop Client if not required
Get-WindowsCapability -Online | Where-Object Name -like '*RemoteDesktop*' | Remove-WindowsCapability -Online
Network Segmentation
windowsRestrict RDP traffic to trusted networks only using firewall rules
New-NetFirewallRule -DisplayName 'Block RDP' -Direction Inbound -Protocol TCP -LocalPort 3389 -Action Block
🧯 If You Can't Patch
- Implement network-level controls to block or restrict RDP traffic
- Use application control to prevent execution of suspicious processes from RDP sessions
🔍 How to Verify
Check if Vulnerable:
Check installed version against Microsoft's security advisory for affected versionsCheck Version:
Get-AppxPackage Microsoft.RemoteDesktop | Select VersionVerify Fix Applied:
Verify Windows Update history shows the relevant security update installed and version matches patched version📡 Detection & Monitoring
Log Indicators:
- Unusual RDP connection attempts
- Process creation from mstsc.exe with suspicious parameters
- Memory access violations in application logs
Network Indicators:
- Anomalous RDP traffic patterns
- Unexpected network connections from RDP client
SIEM Query:
source="security" EventCode=4688 ProcessName="mstsc.exe" | stats count by CommandLine