CVE-2025-22226
📋 TL;DR
This vulnerability allows attackers with administrative privileges on a virtual machine to read memory from the host's vmx process, potentially exposing sensitive information. It affects VMware ESXi, Workstation, and Fusion users. The risk is highest for organizations using shared virtualization infrastructure.
💻 Affected Systems
- VMware ESXi
- VMware Workstation
- VMware Fusion
📦 What is this software?
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⚠️ Risk & Real-World Impact
Worst Case
Sensitive host memory contents including credentials, encryption keys, or other VM data could be exfiltrated, leading to full host compromise.
Likely Case
Information disclosure of host memory contents, potentially revealing configuration details or other sensitive data from the vmx process.
If Mitigated
Limited impact with proper network segmentation and administrative privilege controls in place.
🎯 Exploit Status
Requires administrative access to guest VM and knowledge of exploitation techniques for out-of-bounds read vulnerabilities.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific fixed versions
Vendor Advisory: https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/25390
Restart Required: Yes
Instructions:
1. Review vendor advisory for affected versions. 2. Download and apply the appropriate patch from VMware. 3. Restart affected systems as required.
🔧 Temporary Workarounds
Disable HGFS
allDisable the Host Guest File System feature to prevent exploitation
For ESXi: Check documentation for disabling HGFS per VM
For Workstation/Fusion: Disable shared folders in VM settings
🧯 If You Can't Patch
- Restrict administrative access to VMs to only trusted personnel
- Implement network segmentation to isolate virtualization infrastructure
🔍 How to Verify
Check if Vulnerable:
Check VMware product version against vendor advisory for affected versionsCheck Version:
For ESXi: esxcli system version get; For Workstation/Fusion: Check Help > AboutVerify Fix Applied:
Verify installed version matches or exceeds patched version from vendor advisory📡 Detection & Monitoring
Log Indicators:
- Unusual HGFS-related activity
- Multiple failed HGFS operations
- Memory access patterns from guest VMs
Network Indicators:
- Unusual traffic between guest VMs and host services
SIEM Query:
Search for HGFS-related errors or unusual file system access patterns from guest VMs