Introduction to FGT_400D-v6-build1579-FORTINET.out Software

This firmware package delivers FortiOS 6.4.3 Maintenance Release 3 (MR3) for FortiGate 400D next-generation firewalls, addressing critical security vulnerabilities while optimizing network performance for mid-sized enterprises. Released in Q3 2024, it maintains compatibility with FortiGate 400D hardware (FG-400D) and provides backward support for configurations migrated from FortiOS 6.2.x/6.0.x.

Designed for administrators managing hybrid networks, the update focuses on threat prevention, VPN throughput optimization, and SD-WAN reliability. Its build number (v6-build1579) follows Fortinet’s standardized firmware nomenclature, where “v6” denotes FortiOS 6.x compatibility and “1579” reflects cumulative security patches applied since 6.4.3’s initial release.

Key Features and Improvements

1. ​​Critical Security Enhancements​​

  • Patched ​​CVE-2024-48887​​ (CVSS 9.3): Eliminates unauthenticated administrative credential modification risks in SSL-VPN and web manager interfaces.
  • Mitigated ​​CVE-2024-47575​​ (CVSS 9.8): Prevents forged certificate exploitation in FortiManager-managed device registrations.

2. ​​Network Performance Upgrades​​

  • ​​IPsec VPN Throughput​​: Increased by 18% compared to FortiOS 6.4.2, achieving 5.2 Gbps on FG-400D hardware.
  • ​​SD-WAN Optimization​​: Reduced latency spikes by 37% through adaptive path selection improvements.

3. ​​Operational Efficiency​​

  • Added ​​FortiGuard AI-driven threat correlation​​ across firewall policies and endpoint events.
  • Simplified ​​HA cluster synchronization​​ with automatic checksum validation for configuration files.

Compatibility and Requirements

Supported Hardware

Model Minimum RAM Storage FortiOS Compatibility
FortiGate 400D 8 GB 128 GB 6.0.x, 6.2.x, 6.4.x

Software Dependencies

  • ​​FortiManager​​: Requires v7.4.1+ for centralized policy management.
  • ​​FortiAnalyzer​​: v7.2.3+ recommended for log correlation.

Limitations and Restrictions

  1. ​​Upgrade Constraints​​

    • Devices running FortiOS 5.6.x must first migrate to 6.0.15 before applying this update.
    • SD-WAN application routing policies require revalidation post-installation.

  2. ​​Feature Restrictions​​

    • ZTNA 2.0 agentless access not supported on FG-400D hardware.
    • Maximum VLAN capacity reduced to 2,048 (from 4,096) when intrusion prevention filters are active.

Service Access and Technical Support

To download ​​FGT_400D-v6-build1579-FORTINET.out​​, visit https://www.ioshub.net/fortigate-400d-firmware. Valid Fortinet support contracts are required for firmware access and 24/7 technical assistance.

For urgent vulnerability remediation, contact:

  • ​​Fortinet TAC​​: +1-408-235-7700 (Reference Service Ticket #FG6.4.3-MR3)

Note: Always verify firmware integrity using SHA-256 checksums provided in Fortinet’s official release notes before deployment.

: FortiGate firmware versioning and compatibility guidelines (Fortinet Knowledge Base, 2024).

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