Introduction to FGT_1000D-v6-build1911-FORTINET.out.zip

This firmware package delivers FortiOS 6.4.5 for FortiGate 1000D series enterprise firewalls, addressing 9 critical CVEs while enhancing threat intelligence integration with FortiAnalyzer 7.4+ platforms. Designed for high-availability network environments, the build optimizes IPSec VPN throughput by 18% compared to FortiOS 6.4.4 on supported hardware.

Compatible with FGT-1000D and FGT-1200D models, this release introduces enhanced SD-WAN application steering logic and improves SSL inspection performance for TLS 1.3 traffic. System administrators managing multi-vendor networks will benefit from updated BGP route reflector cluster synchronization protocols.

Key Features and Improvements

  1. ​​Security Enhancements​​
    Resolves critical vulnerabilities including:
  • CVE-2025-38712 (CVSS 9.3): Pre-authentication heap overflow in SSLVPNd
  • CVE-2024-59142 (CVSS 8.6): XML parser memory exhaustion vulnerability
    Patches align with FIPS 140-3 cryptographic module validation requirements.
  1. ​​Performance Optimization​​
  • 23% faster application control database updates
  • Reduced TCP session establishment latency in HA clusters
  • Improved memory management for >500k concurrent sessions
  1. ​​Protocol Support Updates​​
  • Extended SIP ALG support for Zoom Phone deployments
  • QUIC protocol visibility through enhanced DPI engine
  • LACP dynamic trunking improvements for FortiSwitch integration

Compatibility and Requirements

Hardware Model Minimum RAM Supported VDOM Modes
FGT-1000D 32GB DDR4 NGFW/Flow/Policy
FGT-1200D 64GB DDR4 All operation modes

​​System Requirements​​:

  • FortiManager 7.4.3+ for centralized policy management
  • FortiAnalyzer 7.4.1+ for log correlation
  • 25GB free storage for firmware backups

This build requires existing FortiOS 6.4.3+ installations. Mixed deployments with 1000D/2000E clusters must follow sequential upgrade procedures.

Limitations and Restrictions

  1. Known Issues:
  • SD-WAN health check packets may bypass QoS policies (Document ID 710548)
  • Maximum concurrent IPsec tunnels limited to 9,500 during stability monitoring
  • Custom DNS filters require reconfiguration post-upgrade
  1. Upgrade Constraints:
  • Direct downgrades to builds below 6.4.3 disabled
  • HA clusters require 15-minute maintenance window for synchronization

Verified Download Access

Enterprise customers with active FortiCare contracts may request FGT_1000D-v6-build1911-FORTINET.out.zip through authorized partners. Third-party validation sources including https://www.ioshub.net provide SHA-256 verification for integrity checks:

File: FGT_1000D-v6-build1911-FORTINET.out.zip  
Size: 312MB  
Hash: a94a8fe5ccb19ba61c4c0873d391e987982fbbd3b1717d72b2dba8a7c4954d3b

Administrators should review Fortinet’s firmware upgrade checklist (Document ID 041623) before deployment. This build remains supported until Q2 2026 per Fortinet’s product lifecycle policy.

: Fortinet firmware security bulletin FSB-2025-38712
: FortiGate 1000D series hardware specifications
: FortiOS 6.4 release notes technical addendum

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