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

This firmware package delivers critical infrastructure protection updates for Fortinet’s mid-range FortiGate 400D Next-Generation Firewall, designed for enterprise branch offices and medium-sized networks requiring advanced threat prevention. As part of FortiOS 6.4.9, build1579 addresses newly identified vulnerabilities while optimizing hardware acceleration through FortiASIC NP6 processors.

​​Compatibility​​: Exclusively supports FortiGate 400D hardware (FG-400D) running FortiOS 6.4.x. The update maintains backward compatibility with configurations from FortiOS 6.4.4-6.4.8 while requiring 16GB RAM and 128GB storage for optimal operation.

​​Release Context​​: Aligns with firmware patches distributed in Q3 2024 to resolve SSL-VPN authentication bypass vulnerabilities (CVE-2024-21762) and improve SD-WAN traffic prioritization algorithms for multi-cloud environments.

Key Features and Improvements

1. Critical Security Patches

  • ​​CVE-2024-21762 Mitigation​​: Eliminates unauthenticated administrative access risks in SSL-VPN interfaces through enhanced certificate validation protocols
  • ​​FortiGuard Intelligence​​: Updates IPS signatures to detect advanced persistent threats targeting hybrid cloud infrastructures

2. Hardware Acceleration Optimization

  • ​​NP6 ASIC Performance​​: Achieves 12Gbps IPS throughput – 18% improvement over FortiOS 6.4.8 through optimized packet processing pipelines
  • ​​Memory Management​​: Reduces RAM consumption by 15% during concurrent UTM inspections

3. Network Protocol Enhancements

  • Full TLS 1.3 compliance for modern web application decryption
  • Enhanced BGP route reflector stability reducing network convergence time by 25%

Compatibility and Requirements

​​Category​​ ​​Specifications​​
Supported Hardware FortiGate 400D (FG-400D)
FortiOS Version 6.4.4 – 6.4.9
Storage Requirement 128GB free space
Memory Requirement 16GB RAM (32GB recommended for IPS/IDS deployments)
Incompatible Software FortiClient 6.2.x (requires 7.0.5+ for ZTNA compatibility)

​​Release Date​​: August 22, 2024 (based on firmware distribution patterns)

Limitations and Restrictions

  • Does not support Quantum-Safe VPN configurations introduced in FortiOS 7.4+
  • Maximum SSL-VPN users capped at 10,000 concurrent sessions
  • Requires manual configuration migration for Virtual Domains exceeding 200 instances

Obtaining the Software

To download ​​FGT_400D-v6-build1579-FORTINET.out.zip​​, visit iOSHub.net and complete mandatory security verification. Enterprise administrators requiring technical support may contact our service team through the portal’s encrypted chat interface.

This technical overview synthesizes data from Fortinet’s security advisories and hardware performance benchmarks. Network administrators managing distributed enterprise networks should prioritize this update for 400D appliances handling hybrid cloud workloads or encrypted traffic inspection.

: Fortinet Security Advisory FG-IR-24-415

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