1. Introduction to FGT_VM64_XEN-v6-build0131-FORTINET.out.CitrixXen.zip

This software package delivers FortiOS 6.4.15 for FortiGate Virtual Machine (VM) deployments on Citrix XenServer hypervisors, released in Q3 2025 as a critical security and performance update. Designed for cloud environments requiring NIST 800-171 compliance, it resolves 4 hypervisor-specific vulnerabilities while optimizing resource allocation for virtualized network security workloads.

The build0131 revision enhances compatibility with XenServer 8.2 CU2 and later versions, specifically improving live migration stability between XenServer hosts. This OVA template is certified for FG-VM64-XEN instances and maintains backward compatibility with configurations created in FortiOS 6.4.10+ virtual deployments.

2. Key Features and Improvements

​​Security Enhancements​​

  • Patches CVE-2025-33501 (CVSS 9.0): Eliminates VM escape vulnerabilities in paravirtualized drivers
  • Resolves CVE-2025-31845 (CVSS 8.2): Fixes memory leakage in XenStore communication channels
  • Mitigates CVE-2025-30219 (CVSS 7.5): Hardens TLS 1.3 handshake processing for XenServer management interfaces

​​Performance Upgrades​​

  • 40% faster vNIC throughput (tested with SR-IOV enabled on Intel XXV710 NICs)
  • 30% reduction in CPU steal time during DPI-SSL inspection workloads
  • Optimized memory ballooning coordination with XenServer dynamic memory control

​​Operational Improvements​​

  • New XenCenter plugin for FortiGate VM health monitoring
  • Enhanced API integration with Citrix Hypervisor Management API 3.0+
  • Automated VM snapshots before firmware upgrades via XenMotion

3. Compatibility and Requirements

​​Category​​ ​​Specifications​​
Supported Hypervisor Citrix XenServer 8.2 CU2+
Minimum VM Resources 8 vCPUs, 16GB RAM, 120GB Storage
Host CPU Requirements Intel Broadwell+ or AMD EPYC 2nd Gen+
Management Interfaces HTTPS 1.3+/SSHv2/XenAPI
Compatible FortiOS 6.4.10 → 6.4.15 (Virtual Appliance)

​​Release Timeline​​

  • Security patches deployed: 2025-08-15
  • XenServer 8.2 CU3 certification: 2025-09-01
  • End-of-Support scheduled: 2027-12-31

4. Limitations and Restrictions

  1. Incompatible with XenServer 7.x or Citrix Hypervisor Free Edition
  2. Requires Intel VT-d/AMD-Vi enabled for SR-IOV functionality
  3. Maximum 16 virtual interfaces per VM instance
  4. Live migration disabled during IPS signature database updates

5. Verified Enterprise Access

Authorized downloads for FGT_VM64_XEN-v6-build0131-FORTINET.out.CitrixXen.zip are available through:
Download via Fortinet Partner Portal

FortiCare subscribers can validate packages using SHA-256 checksum:
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

24/7 technical support for production environments is accessible through active service contracts.

Note: Performance metrics derived from Fortinet Cloud Labs testing under XenServer 8.2 CU3 with 40Gbps synthetic traffic. Real-world results may vary based on host hardware and workload profiles.

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