CVE-2025-41246
📋 TL;DR
VMware Tools for Windows has an improper authorization vulnerability that allows authenticated non-administrative users on a guest VM to access other guest VMs. Attackers need valid credentials for both the initial VM and target VMs/vCenter/ESX. This affects VMware environments with Windows guest VMs using VMware Tools.
💻 Affected Systems
- VMware Tools for Windows
⚠️ 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
Lateral movement across the virtual environment leading to complete compromise of multiple VMs, data exfiltration, and potential ransomware deployment.
Likely Case
Unauthorized access to specific target VMs for data theft or reconnaissance, limited by attacker's credential knowledge.
If Mitigated
Minimal impact due to strong credential management, network segmentation, and proper access controls limiting lateral movement.
🎯 Exploit Status
Exploitation requires multiple conditions: authenticated access to initial VM, knowledge of target VM credentials, and vCenter/ESX authentication. This raises the barrier but doesn't eliminate risk for determined attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched versions
Vendor Advisory: https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/36149
Restart Required: Yes
Instructions:
1. Review vendor advisory for affected versions. 2. Download and install the latest VMware Tools update for Windows guests. 3. Restart affected Windows guest VMs. 4. Verify patch installation.
🔧 Temporary Workarounds
Restrict User Privileges
windowsLimit non-administrative user access to minimize attack surface
Implement least privilege principle for all VM users
Network Segmentation
allIsolate VMs to prevent lateral movement even if vulnerability is exploited
Configure VLANs, firewall rules, and network policies to restrict VM-to-VM communication
🧯 If You Can't Patch
- Implement strict credential management and rotation policies
- Enhance monitoring for unusual VM access patterns and lateral movement
🔍 How to Verify
Check if Vulnerable:
Check VMware Tools version on Windows guest VMs against vendor advisoryCheck Version:
In Windows guest VM: Open VMware Tools from system tray or check Programs and Features for versionVerify Fix Applied:
Verify VMware Tools version matches or exceeds patched version from vendor advisory📡 Detection & Monitoring
Log Indicators:
- Unusual authentication attempts between VMs
- VMware Tools service anomalies
- Unexpected VM access patterns
Network Indicators:
- Abnormal VM-to-VM communication patterns
- Unexpected authentication traffic between VMs
SIEM Query:
Search for VMware Tools service events followed by cross-VM authentication attempts within short timeframes